diff --git a/Process.c b/Process.c
index 2b39a2ab..fc105cbe 100644
--- a/Process.c
+++ b/Process.c
@@ -38,23 +38,15 @@ in the source distribution for its full text.
 
 static uid_t Process_getuid = (uid_t)-1;
 
-char Process_pidFormat[20] = "%7d ";
-
-static char Process_titleBuffer[20][20];
+int Process_pidDigits = 7;
 
 void Process_setupColumnWidths() {
    int maxPid = Platform_getMaxPid();
    if (maxPid == -1)
       return;
 
-   int digits = ceil(log10(maxPid));
-   assert(digits < 20);
-   for (int i = 0; Process_pidColumns[i].label; i++) {
-      assert(i < 20);
-      xSnprintf(Process_titleBuffer[i], 20, "%*s ", digits, Process_pidColumns[i].label);
-      Process_fields[Process_pidColumns[i].id].title = Process_titleBuffer[i];
-   }
-   xSnprintf(Process_pidFormat, sizeof(Process_pidFormat), "%%%dd ", digits);
+   Process_pidDigits = ceil(log10(maxPid));
+   assert(Process_pidDigits <= PROCESS_MAX_PID_DIGITS);
 }
 
 void Process_humanNumber(RichString* str, unsigned long long number, bool coloring) {
@@ -338,9 +330,9 @@ void Process_writeField(const Process* this, RichString* str, ProcessField field
       break;
    }
    case NLWP: xSnprintf(buffer, n, "%4ld ", this->nlwp); break;
-   case PGRP: xSnprintf(buffer, n, Process_pidFormat, this->pgrp); break;
-   case PID: xSnprintf(buffer, n, Process_pidFormat, this->pid); break;
-   case PPID: xSnprintf(buffer, n, Process_pidFormat, this->ppid); break;
+   case PGRP: xSnprintf(buffer, n, "%*d ", Process_pidDigits, this->pgrp); break;
+   case PID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, this->pid); break;
+   case PPID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, this->ppid); break;
    case PRIORITY: {
       if(this->priority <= -100)
          xSnprintf(buffer, n, " RT ");
@@ -349,7 +341,7 @@ void Process_writeField(const Process* this, RichString* str, ProcessField field
       break;
    }
    case PROCESSOR: xSnprintf(buffer, n, "%3d ", Settings_cpuId(this->settings, this->processor)); break;
-   case SESSION: xSnprintf(buffer, n, Process_pidFormat, this->session); break;
+   case SESSION: xSnprintf(buffer, n, "%*d ", Process_pidDigits, this->session); break;
    case STARTTIME: xSnprintf(buffer, n, "%s", this->starttime_show); break;
    case STATE: {
       xSnprintf(buffer, n, "%c ", this->state);
@@ -365,8 +357,8 @@ void Process_writeField(const Process* this, RichString* str, ProcessField field
    }
    case ST_UID: xSnprintf(buffer, n, "%5d ", this->st_uid); break;
    case TIME: Process_printTime(str, this->time); return;
-   case TGID: xSnprintf(buffer, n, Process_pidFormat, this->tgid); break;
-   case TPGID: xSnprintf(buffer, n, Process_pidFormat, this->tpgid); break;
+   case TGID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, this->tgid); break;
+   case TPGID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, this->tpgid); break;
    case TTY_NR: xSnprintf(buffer, n, "%3u:%3u ", major(this->tty_nr), minor(this->tty_nr)); break;
    case USER: {
       if (Process_getuid != this->st_uid)
diff --git a/Process.h b/Process.h
index 9a134bb3..91d39409 100644
--- a/Process.h
+++ b/Process.h
@@ -53,11 +53,6 @@ typedef enum ProcessField_ {
    LAST_PROCESSFIELD
 } ProcessField;
 
-typedef struct ProcessPidColumn_ {
-   int id;
-   const char* label;
-} ProcessPidColumn;
-
 struct Settings_;
 
 typedef struct Process_ {
@@ -122,6 +117,7 @@ typedef struct ProcessFieldData_ {
    const char* title;
    const char* description;
    uint32_t flags;
+   bool pidColumn;
 } ProcessFieldData;
 
 // Implemented in platform-specific code:
@@ -129,9 +125,9 @@ void Process_writeField(const Process* this, RichString* str, ProcessField field
 long Process_compare(const void* v1, const void* v2);
 void Process_delete(Object* cast);
 bool Process_isThread(const Process* this);
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
-extern ProcessPidColumn Process_pidColumns[];
-extern char Process_pidFormat[20];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
+#define PROCESS_MAX_PID_DIGITS 19
+extern int Process_pidDigits;
 
 typedef Process*(*Process_New)(const struct Settings_*);
 typedef void (*Process_WriteField)(const Process*, RichString*, ProcessField);
diff --git a/ProcessList.c b/ProcessList.c
index 02ce373f..d0bd89fe 100644
--- a/ProcessList.c
+++ b/ProcessList.c
@@ -79,6 +79,20 @@ void ProcessList_setPanel(ProcessList* this, Panel* panel) {
    this->panel = panel;
 }
 
+static const char* alignedProcessFieldTitle(ProcessField field) {
+   const char* title = Process_fields[field].title;
+   if (!title)
+      return "- ";
+
+   if (!Process_fields[field].pidColumn)
+      return title;
+
+   static char titleBuffer[PROCESS_MAX_PID_DIGITS + /* space */ 1 + /* null-terminator */ + 1];
+   xSnprintf(titleBuffer, sizeof(titleBuffer), "%*s ", Process_pidDigits, title);
+
+   return titleBuffer;
+}
+
 void ProcessList_printHeader(ProcessList* this, RichString* header) {
    RichString_prune(header);
 
@@ -88,11 +102,6 @@ void ProcessList_printHeader(ProcessList* this, RichString* header) {
    ProcessField key = Settings_getActiveSortKey(settings);
 
    for (int i = 0; fields[i]; i++) {
-      const char* field = Process_fields[fields[i]].title;
-      if (!field) {
-         field = "- ";
-      }
-
       int color;
       if (settings->treeView && settings->treeViewAlwaysByPID) {
          color = CRT_colors[PANEL_HEADER_FOCUS];
@@ -102,7 +111,7 @@ void ProcessList_printHeader(ProcessList* this, RichString* header) {
          color = CRT_colors[PANEL_HEADER_FOCUS];
       }
 
-      RichString_appendWide(header, color, field);
+      RichString_appendWide(header, color, alignedProcessFieldTitle(fields[i]));
       if (COMM == fields[i] && settings->showMergedCommand) {
          RichString_appendAscii(header, color, "(merged)");
       }
@@ -456,12 +465,7 @@ ProcessField ProcessList_keyAt(const ProcessList* this, int at) {
    const ProcessField* fields = this->settings->fields;
    ProcessField field;
    for (int i = 0; (field = fields[i]); i++) {
-      const char* title = Process_fields[field].title;
-      if (!title) {
-         title = "- ";
-      }
-
-      int len = strlen(title);
+      int len = strlen(alignedProcessFieldTitle(field));
       if (at >= x && at <= x + len) {
          return field;
       }
diff --git a/darwin/DarwinProcess.c b/darwin/DarwinProcess.c
index 8f11e338..94bb193e 100644
--- a/darwin/DarwinProcess.c
+++ b/darwin/DarwinProcess.c
@@ -18,16 +18,16 @@ in the source distribution for its full text.
 #include "Process.h"
 
 
-ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [0] = { .name = "", .title = NULL, .description = NULL, .flags = 0, },
-   [PID] = { .name = "PID", .title = "    PID ", .description = "Process/thread ID", .flags = 0, },
+   [PID] = { .name = "PID", .title = "PID", .description = "Process/thread ID", .flags = 0, .pidColumn = true, },
    [COMM] = { .name = "Command", .title = "Command ", .description = "Command line", .flags = 0, },
    [STATE] = { .name = "STATE", .title = "S ", .description = "Process state (S sleeping, R running, D disk, Z zombie, T traced, W paging)", .flags = 0, },
-   [PPID] = { .name = "PPID", .title = "   PPID ", .description = "Parent process ID", .flags = 0, },
-   [PGRP] = { .name = "PGRP", .title = "   PGRP ", .description = "Process group ID", .flags = 0, },
-   [SESSION] = { .name = "SESSION", .title = "    SID ", .description = "Process's session ID", .flags = 0, },
+   [PPID] = { .name = "PPID", .title = "PPID", .description = "Parent process ID", .flags = 0, .pidColumn = true, },
+   [PGRP] = { .name = "PGRP", .title = "PGRP", .description = "Process group ID", .flags = 0, .pidColumn = true, },
+   [SESSION] = { .name = "SESSION", .title = "SID", .description = "Process's session ID", .flags = 0, .pidColumn = true, },
    [TTY_NR] = { .name = "TTY_NR", .title = "    TTY ", .description = "Controlling terminal", .flags = 0, },
-   [TPGID] = { .name = "TPGID", .title = "  TPGID ", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, },
+   [TPGID] = { .name = "TPGID", .title = "TPGID", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, .pidColumn = true, },
    [MINFLT] = { .name = "MINFLT", .title = "     MINFLT ", .description = "Number of minor faults which have not required loading a memory page from disk", .flags = 0, },
    [MAJFLT] = { .name = "MAJFLT", .title = "     MAJFLT ", .description = "Number of major faults which have required loading a memory page from disk", .flags = 0, },
    [PRIORITY] = { .name = "PRIORITY", .title = "PRI ", .description = "Kernel's internal priority for the process", .flags = 0, },
@@ -43,7 +43,7 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [USER] = { .name = "USER", .title = "USER      ", .description = "Username of the process owner (or user ID if name cannot be determined)", .flags = 0, },
    [TIME] = { .name = "TIME", .title = "  TIME+  ", .description = "Total time the process has spent in user and system time", .flags = 0, },
    [NLWP] = { .name = "NLWP", .title = "NLWP ", .description = "Number of threads in the process", .flags = 0, },
-   [TGID] = { .name = "TGID", .title = "   TGID ", .description = "Thread group ID (i.e. process ID)", .flags = 0, },
+   [TGID] = { .name = "TGID", .title = "TGID", .description = "Thread group ID (i.e. process ID)", .flags = 0, .pidColumn = true, },
    [TRANSLATED] = { .name = "TRANSLATED", .title = "T ", .description = "Translation info (T translated, N native)", .flags = 0, },
 };
 
diff --git a/darwin/DarwinProcess.h b/darwin/DarwinProcess.h
index 60b57dfa..21da34af 100644
--- a/darwin/DarwinProcess.h
+++ b/darwin/DarwinProcess.h
@@ -24,7 +24,7 @@ typedef struct DarwinProcess_ {
 
 extern const ProcessClass DarwinProcess_class;
 
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
 
 Process* DarwinProcess_new(const Settings* settings);
 
diff --git a/darwin/Platform.c b/darwin/Platform.c
index 0fe2ac7f..13ebceb1 100644
--- a/darwin/Platform.c
+++ b/darwin/Platform.c
@@ -166,16 +166,6 @@ int Platform_getMaxPid() {
    return 99999;
 }
 
-ProcessPidColumn Process_pidColumns[] = {
-   { .id = PID, .label = "PID" },
-   { .id = PPID, .label = "PPID" },
-   { .id = TPGID, .label = "TPGID" },
-   { .id = TGID, .label = "TGID" },
-   { .id = PGRP, .label = "PGRP" },
-   { .id = SESSION, .label = "SID" },
-   { .id = 0, .label = NULL },
-};
-
 static double Platform_setCPUAverageValues(Meter* mtr) {
    const ProcessList* dpl = mtr->pl;
    int cpus = dpl->cpuCount;
diff --git a/darwin/Platform.h b/darwin/Platform.h
index 1c743725..23132bb2 100644
--- a/darwin/Platform.h
+++ b/darwin/Platform.h
@@ -42,8 +42,6 @@ void Platform_getLoadAverage(double* one, double* five, double* fifteen);
 
 int Platform_getMaxPid(void);
 
-extern ProcessPidColumn Process_pidColumns[];
-
 double Platform_setCPUValues(Meter* mtr, int cpu);
 
 void Platform_setMemoryValues(Meter* mtr);
diff --git a/dragonflybsd/DragonFlyBSDProcess.c b/dragonflybsd/DragonFlyBSDProcess.c
index 31211725..20fe5e78 100644
--- a/dragonflybsd/DragonFlyBSDProcess.c
+++ b/dragonflybsd/DragonFlyBSDProcess.c
@@ -29,16 +29,16 @@ const ProcessClass DragonFlyBSDProcess_class = {
    .compareByKey = DragonFlyBSDProcess_compareByKey
 };
 
-ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [0] = { .name = "", .title = NULL, .description = NULL, .flags = 0, },
-   [PID] = { .name = "PID", .title = "    PID ", .description = "Process/thread ID", .flags = 0, },
+   [PID] = { .name = "PID", .title = "PID", .description = "Process/thread ID", .flags = 0, .pidColumn = true, },
    [COMM] = { .name = "Command", .title = "Command ", .description = "Command line", .flags = 0, },
    [STATE] = { .name = "STATE", .title = "S ", .description = "Process state (S sleeping (<20s), I Idle, Q Queued for Run, R running, D disk, Z zombie, T traced, W paging, B Blocked, A AskedPage, C Core, J Jailed)", .flags = 0, },
-   [PPID] = { .name = "PPID", .title = "   PPID ", .description = "Parent process ID", .flags = 0, },
-   [PGRP] = { .name = "PGRP", .title = "   PGRP ", .description = "Process group ID", .flags = 0, },
-   [SESSION] = { .name = "SESSION", .title = "    SID ", .description = "Process's session ID", .flags = 0, },
+   [PPID] = { .name = "PPID", .title = "PPID", .description = "Parent process ID", .flags = 0, .pidColumn = true, },
+   [PGRP] = { .name = "PGRP", .title = "PGRP", .description = "Process group ID", .flags = 0, .pidColumn = true, },
+   [SESSION] = { .name = "SESSION", .title = "SID", .description = "Process's session ID", .flags = 0, .pidColumn = true, },
    [TTY_NR] = { .name = "TTY_NR", .title = "    TTY ", .description = "Controlling terminal", .flags = 0, },
-   [TPGID] = { .name = "TPGID", .title = "  TPGID ", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, },
+   [TPGID] = { .name = "TPGID", .title = "TPGID", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, .pidColumn = true, },
    [MINFLT] = { .name = "MINFLT", .title = "     MINFLT ", .description = "Number of minor faults which have not required loading a memory page from disk", .flags = 0, },
    [MAJFLT] = { .name = "MAJFLT", .title = "     MAJFLT ", .description = "Number of major faults which have required loading a memory page from disk", .flags = 0, },
    [PRIORITY] = { .name = "PRIORITY", .title = "PRI ", .description = "Kernel's internal priority for the process", .flags = 0, },
@@ -54,22 +54,11 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [USER] = { .name = "USER", .title = "USER      ", .description = "Username of the process owner (or user ID if name cannot be determined)", .flags = 0, },
    [TIME] = { .name = "TIME", .title = "  TIME+  ", .description = "Total time the process has spent in user and system time", .flags = 0, },
    [NLWP] = { .name = "NLWP", .title = "NLWP ", .description = "Number of threads in the process", .flags = 0, },
-   [TGID] = { .name = "TGID", .title = "   TGID ", .description = "Thread group ID (i.e. process ID)", .flags = 0, },
-   [JID] = { .name = "JID", .title = "    JID ", .description = "Jail prison ID", .flags = 0, },
+   [TGID] = { .name = "TGID", .title = "TGID", .description = "Thread group ID (i.e. process ID)", .flags = 0, .pidColumn = true, },
+   [JID] = { .name = "JID", .title = "JID", .description = "Jail prison ID", .flags = 0, .pidColumn = true, },
    [JAIL] = { .name = "JAIL", .title = "JAIL        ", .description = "Jail prison name", .flags = 0, },
 };
 
-ProcessPidColumn Process_pidColumns[] = {
-   { .id = JID, .label = "JID" },
-   { .id = PID, .label = "PID" },
-   { .id = PPID, .label = "PPID" },
-   { .id = TPGID, .label = "TPGID" },
-   { .id = TGID, .label = "TGID" },
-   { .id = PGRP, .label = "PGRP" },
-   { .id = SESSION, .label = "SID" },
-   { .id = 0, .label = NULL },
-};
-
 Process* DragonFlyBSDProcess_new(const Settings* settings) {
    DragonFlyBSDProcess* this = xCalloc(1, sizeof(DragonFlyBSDProcess));
    Object_setClass(this, Class(DragonFlyBSDProcess));
@@ -91,8 +80,8 @@ void DragonFlyBSDProcess_writeField(const Process* this, RichString* str, Proces
    int n = sizeof(buffer) - 1;
    switch (field) {
    // add Platform-specific fields here
-   case PID: xSnprintf(buffer, n, Process_pidFormat, (fp->kernel ? -1 : this->pid)); break;
-   case JID: xSnprintf(buffer, n, Process_pidFormat, fp->jid); break;
+   case PID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, (fp->kernel ? -1 : this->pid)); break;
+   case JID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, fp->jid); break;
    case JAIL: {
       xSnprintf(buffer, n, "%-11s ", fp->jname);
       if (buffer[11] != '\0') {
diff --git a/dragonflybsd/DragonFlyBSDProcess.h b/dragonflybsd/DragonFlyBSDProcess.h
index 7d5d3e52..1527417b 100644
--- a/dragonflybsd/DragonFlyBSDProcess.h
+++ b/dragonflybsd/DragonFlyBSDProcess.h
@@ -22,9 +22,7 @@ typedef struct DragonFlyBSDProcess_ {
 
 extern const ProcessClass DragonFlyBSDProcess_class;
 
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
-
-extern ProcessPidColumn Process_pidColumns[];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
 
 Process* DragonFlyBSDProcess_new(const Settings* settings);
 
diff --git a/freebsd/FreeBSDProcess.c b/freebsd/FreeBSDProcess.c
index ff4b2df1..01edb8eb 100644
--- a/freebsd/FreeBSDProcess.c
+++ b/freebsd/FreeBSDProcess.c
@@ -18,16 +18,16 @@ in the source distribution for its full text.
 
 const char* const nodevStr = "nodev";
 
-ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [0] = { .name = "", .title = NULL, .description = NULL, .flags = 0, },
-   [PID] = { .name = "PID", .title = "    PID ", .description = "Process/thread ID", .flags = 0, },
+   [PID] = { .name = "PID", .title = "PID", .description = "Process/thread ID", .flags = 0, .pidColumn = true, },
    [COMM] = { .name = "Command", .title = "Command ", .description = "Command line", .flags = 0, },
    [STATE] = { .name = "STATE", .title = "S ", .description = "Process state (S sleeping, R running, D disk, Z zombie, T traced, W paging)", .flags = 0, },
-   [PPID] = { .name = "PPID", .title = "   PPID ", .description = "Parent process ID", .flags = 0, },
-   [PGRP] = { .name = "PGRP", .title = "   PGRP ", .description = "Process group ID", .flags = 0, },
-   [SESSION] = { .name = "SESSION", .title = "    SID ", .description = "Process's session ID", .flags = 0, },
+   [PPID] = { .name = "PPID", .title = "PPID", .description = "Parent process ID", .flags = 0, .pidColumn = true, },
+   [PGRP] = { .name = "PGRP", .title = "PGRP", .description = "Process group ID", .flags = 0, .pidColumn = true, },
+   [SESSION] = { .name = "SESSION", .title = "SID", .description = "Process's session ID", .flags = 0, .pidColumn = true, },
    [TTY_NR] = { .name = "TTY_NR", .title = "    TTY ", .description = "Controlling terminal", .flags = PROCESS_FLAG_FREEBSD_TTY, },
-   [TPGID] = { .name = "TPGID", .title = "  TPGID ", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, },
+   [TPGID] = { .name = "TPGID", .title = "TPGID", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, .pidColumn = true, },
    [MINFLT] = { .name = "MINFLT", .title = "     MINFLT ", .description = "Number of minor faults which have not required loading a memory page from disk", .flags = 0, },
    [MAJFLT] = { .name = "MAJFLT", .title = "     MAJFLT ", .description = "Number of major faults which have required loading a memory page from disk", .flags = 0, },
    [PRIORITY] = { .name = "PRIORITY", .title = "PRI ", .description = "Kernel's internal priority for the process", .flags = 0, },
@@ -44,22 +44,11 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [USER] = { .name = "USER", .title = "USER      ", .description = "Username of the process owner (or user ID if name cannot be determined)", .flags = 0, },
    [TIME] = { .name = "TIME", .title = "  TIME+  ", .description = "Total time the process has spent in user and system time", .flags = 0, },
    [NLWP] = { .name = "NLWP", .title = "NLWP ", .description = "Number of threads in the process", .flags = 0, },
-   [TGID] = { .name = "TGID", .title = "   TGID ", .description = "Thread group ID (i.e. process ID)", .flags = 0, },
-   [JID] = { .name = "JID", .title = "    JID ", .description = "Jail prison ID", .flags = 0, },
+   [TGID] = { .name = "TGID", .title = "TGID", .description = "Thread group ID (i.e. process ID)", .flags = 0, .pidColumn = true, },
+   [JID] = { .name = "JID", .title = "JID", .description = "Jail prison ID", .flags = 0, .pidColumn = true, },
    [JAIL] = { .name = "JAIL", .title = "JAIL        ", .description = "Jail prison name", .flags = 0, },
 };
 
-ProcessPidColumn Process_pidColumns[] = {
-   { .id = JID, .label = "JID" },
-   { .id = PID, .label = "PID" },
-   { .id = PPID, .label = "PPID" },
-   { .id = TPGID, .label = "TPGID" },
-   { .id = TGID, .label = "TGID" },
-   { .id = PGRP, .label = "PGRP" },
-   { .id = SESSION, .label = "SID" },
-   { .id = 0, .label = NULL },
-};
-
 Process* FreeBSDProcess_new(const Settings* settings) {
    FreeBSDProcess* this = xCalloc(1, sizeof(FreeBSDProcess));
    Object_setClass(this, Class(FreeBSDProcess));
@@ -81,7 +70,7 @@ static void FreeBSDProcess_writeField(const Process* this, RichString* str, Proc
    int n = sizeof(buffer) - 1;
    switch (field) {
    // add FreeBSD-specific fields here
-   case JID: xSnprintf(buffer, n, Process_pidFormat, fp->jid); break;
+   case JID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, fp->jid); break;
    case JAIL: {
       xSnprintf(buffer, n, "%-11s ", fp->jname);
       if (buffer[11] != '\0') {
diff --git a/freebsd/FreeBSDProcess.h b/freebsd/FreeBSDProcess.h
index 96b70ec4..6bf2c93d 100644
--- a/freebsd/FreeBSDProcess.h
+++ b/freebsd/FreeBSDProcess.h
@@ -36,9 +36,7 @@ static inline bool Process_isUserlandThread(const Process* this) {
 
 extern const ProcessClass FreeBSDProcess_class;
 
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
-
-extern ProcessPidColumn Process_pidColumns[];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
 
 Process* FreeBSDProcess_new(const Settings* settings);
 
diff --git a/linux/LinuxProcess.c b/linux/LinuxProcess.c
index a8b62cc0..18679ff7 100644
--- a/linux/LinuxProcess.c
+++ b/linux/LinuxProcess.c
@@ -30,16 +30,16 @@ int pageSizeKB;
 /* Used to identify kernel threads in Comm and Exe columns */
 static const char *const kthreadID = "KTHREAD";
 
-ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [0] = { .name = "", .title = NULL, .description = NULL, .flags = 0, },
-   [PID] = { .name = "PID", .title = "    PID ", .description = "Process/thread ID", .flags = 0, },
+   [PID] = { .name = "PID", .title = "PID", .description = "Process/thread ID", .flags = 0, .pidColumn = true, },
    [COMM] = { .name = "Command", .title = "Command ", .description = "Command line", .flags = 0, },
    [STATE] = { .name = "STATE", .title = "S ", .description = "Process state (S sleeping, R running, D disk, Z zombie, T traced, W paging, I idle)", .flags = 0, },
-   [PPID] = { .name = "PPID", .title = "   PPID ", .description = "Parent process ID", .flags = 0, },
-   [PGRP] = { .name = "PGRP", .title = "   PGRP ", .description = "Process group ID", .flags = 0, },
-   [SESSION] = { .name = "SESSION", .title = "    SID ", .description = "Process's session ID", .flags = 0, },
+   [PPID] = { .name = "PPID", .title = "PPID", .description = "Parent process ID", .flags = 0, .pidColumn = true, },
+   [PGRP] = { .name = "PGRP", .title = "PGRP", .description = "Process group ID", .flags = 0, .pidColumn = true, },
+   [SESSION] = { .name = "SESSION", .title = "SID", .description = "Process's session ID", .flags = 0, .pidColumn = true, },
    [TTY_NR] = { .name = "TTY_NR", .title = "TTY      ", .description = "Controlling terminal", .flags = 0, },
-   [TPGID] = { .name = "TPGID", .title = "  TPGID ", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, },
+   [TPGID] = { .name = "TPGID", .title = "TPGID", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, .pidColumn = true, },
    [MINFLT] = { .name = "MINFLT", .title = "     MINFLT ", .description = "Number of minor faults which have not required loading a memory page from disk", .flags = 0, },
    [CMINFLT] = { .name = "CMINFLT", .title = "    CMINFLT ", .description = "Children processes' minor faults", .flags = 0, },
    [MAJFLT] = { .name = "MAJFLT", .title = "     MAJFLT ", .description = "Number of major faults which have required loading a memory page from disk", .flags = 0, },
@@ -66,10 +66,10 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [USER] = { .name = "USER", .title = "USER      ", .description = "Username of the process owner (or user ID if name cannot be determined)", .flags = 0, },
    [TIME] = { .name = "TIME", .title = "  TIME+  ", .description = "Total time the process has spent in user and system time", .flags = 0, },
    [NLWP] = { .name = "NLWP", .title = "NLWP ", .description = "Number of threads in the process", .flags = 0, },
-   [TGID] = { .name = "TGID", .title = "   TGID ", .description = "Thread group ID (i.e. process ID)", .flags = 0, },
+   [TGID] = { .name = "TGID", .title = "TGID", .description = "Thread group ID (i.e. process ID)", .flags = 0, .pidColumn = true, },
 #ifdef HAVE_OPENVZ
    [CTID] = { .name = "CTID", .title = " CTID    ", .description = "OpenVZ container ID (a.k.a. virtual environment ID)", .flags = PROCESS_FLAG_LINUX_OPENVZ, },
-   [VPID] = { .name = "VPID", .title = "    VPID ", .description = "OpenVZ process ID", .flags = PROCESS_FLAG_LINUX_OPENVZ, },
+   [VPID] = { .name = "VPID", .title = "VPID", .description = "OpenVZ process ID", .flags = PROCESS_FLAG_LINUX_OPENVZ, .pidColumn = true, },
 #endif
 #ifdef HAVE_VSERVER
    [VXID] = { .name = "VXID", .title = " VXID ", .description = "VServer process ID", .flags = PROCESS_FLAG_LINUX_VSERVER, },
@@ -102,19 +102,6 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [CWD] = { .name ="CWD", .title = "CWD                       ", .description = "The current working directory of the process", .flags = PROCESS_FLAG_LINUX_CWD, },
 };
 
-ProcessPidColumn Process_pidColumns[] = {
-   { .id = PID, .label = "PID" },
-   { .id = PPID, .label = "PPID" },
-   #ifdef HAVE_OPENVZ
-   { .id = VPID, .label = "VPID" },
-   #endif
-   { .id = TPGID, .label = "TPGID" },
-   { .id = TGID, .label = "TGID" },
-   { .id = PGRP, .label = "PGRP" },
-   { .id = SESSION, .label = "SID" },
-   { .id = 0, .label = NULL },
-};
-
 /* This function returns the string displayed in Command column, so that sorting
  * happens on what is displayed - whether comm, full path, basename, etc.. So
  * this follows LinuxProcess_writeField(COMM) and LinuxProcess_writeCommand */
@@ -662,7 +649,7 @@ static void LinuxProcess_writeField(const Process* this, RichString* str, Proces
    }
    #ifdef HAVE_OPENVZ
    case CTID: xSnprintf(buffer, n, "%-8s ", lp->ctid ? lp->ctid : ""); break;
-   case VPID: xSnprintf(buffer, n, Process_pidFormat, lp->vpid); break;
+   case VPID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, lp->vpid); break;
    #endif
    #ifdef HAVE_VSERVER
    case VXID: xSnprintf(buffer, n, "%5u ", lp->vxid); break;
diff --git a/linux/LinuxProcess.h b/linux/LinuxProcess.h
index 16667827..719a4e9b 100644
--- a/linux/LinuxProcess.h
+++ b/linux/LinuxProcess.h
@@ -127,9 +127,7 @@ extern int pageSize;
 
 extern int pageSizeKB;
 
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
-
-extern ProcessPidColumn Process_pidColumns[];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
 
 extern const ProcessClass LinuxProcess_class;
 
diff --git a/openbsd/OpenBSDProcess.c b/openbsd/OpenBSDProcess.c
index 0ac08c66..642e9bea 100644
--- a/openbsd/OpenBSDProcess.c
+++ b/openbsd/OpenBSDProcess.c
@@ -16,7 +16,7 @@ in the source distribution for its full text.
 #include "XUtils.h"
 
 
-ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [0] = {
       .name = "",
       .title = NULL,
@@ -25,9 +25,10 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    },
    [PID] = {
       .name = "PID",
-      .title = "    PID ",
+      .title = "PID",
       .description = "Process/thread ID",
       .flags = 0,
+      .pidColumn = true,
    },
    [COMM] = {
       .name = "Command",
@@ -43,21 +44,24 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    },
    [PPID] = {
       .name = "PPID",
-      .title = "   PPID ",
+      .title = "PPID",
       .description = "Parent process ID",
       .flags = 0,
+      .pidColumn = true,
    },
    [PGRP] = {
       .name = "PGRP",
-      .title = "   PGRP ",
+      .title = "PGRP",
       .description = "Process group ID",
       .flags = 0,
+      .pidColumn = true,
    },
    [SESSION] = {
       .name = "SESSION",
-      .title = "   SESN ",
+      .title = "SESN",
       .description = "Process's session ID",
       .flags = 0,
+      .pidColumn = true,
    },
    [TTY_NR] = {
       .name = "TTY_NR",
@@ -67,9 +71,10 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    },
    [TPGID] = {
       .name = "TPGID",
-      .title = "  TPGID ",
+      .title = "TPGID",
       .description = "Process ID of the fg process group of the controlling terminal",
       .flags = 0,
+      .pidColumn = true,
    },
    [MINFLT] = {
       .name = "MINFLT",
@@ -163,22 +168,13 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    },
    [TGID] = {
       .name = "TGID",
-      .title = "   TGID ",
+      .title = "TGID",
       .description = "Thread group ID (i.e. process ID)",
       .flags = 0,
+      .pidColumn = true,
    },
 };
 
-ProcessPidColumn Process_pidColumns[] = {
-   { .id = PID, .label = "PID" },
-   { .id = PPID, .label = "PPID" },
-   { .id = TPGID, .label = "TPGID" },
-   { .id = TGID, .label = "TGID" },
-   { .id = PGRP, .label = "PGRP" },
-   { .id = SESSION, .label = "SESN" },
-   { .id = 0, .label = NULL },
-};
-
 Process* OpenBSDProcess_new(const Settings* settings) {
    OpenBSDProcess* this = xCalloc(sizeof(OpenBSDProcess), 1);
    Object_setClass(this, Class(OpenBSDProcess));
diff --git a/openbsd/OpenBSDProcess.h b/openbsd/OpenBSDProcess.h
index 6b28025a..6aab29a0 100644
--- a/openbsd/OpenBSDProcess.h
+++ b/openbsd/OpenBSDProcess.h
@@ -25,9 +25,7 @@ typedef struct OpenBSDProcess_ {
 
 extern const ProcessClass OpenBSDProcess_class;
 
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
-
-extern ProcessPidColumn Process_pidColumns[];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
 
 Process* OpenBSDProcess_new(const Settings* settings);
 
diff --git a/solaris/SolarisProcess.c b/solaris/SolarisProcess.c
index 3d4f9538..e3597360 100644
--- a/solaris/SolarisProcess.c
+++ b/solaris/SolarisProcess.c
@@ -29,16 +29,16 @@ const ProcessClass SolarisProcess_class = {
    .compareByKey = SolarisProcess_compareByKey
 };
 
-ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [0] = { .name = "", .title = NULL, .description = NULL, .flags = 0, },
-   [PID] = { .name = "PID", .title = "    PID    ", .description = "Process/thread ID", .flags = 0, },
+   [PID] = { .name = "PID", .title = "PID", .description = "Process/thread ID", .flags = 0, .pidColumn = true, },
    [COMM] = { .name = "Command", .title = "Command ", .description = "Command line", .flags = 0, },
    [STATE] = { .name = "STATE", .title = "S ", .description = "Process state (S sleeping, R running, O onproc, Z zombie, T stopped, W waiting)", .flags = 0, },
-   [PPID] = { .name = "PPID", .title = "   PPID ", .description = "Parent process ID", .flags = 0, },
-   [PGRP] = { .name = "PGRP", .title = "   PGRP ", .description = "Process group ID", .flags = 0, },
-   [SESSION] = { .name = "SESSION", .title = "    SID ", .description = "Process's session ID", .flags = 0, },
+   [PPID] = { .name = "PPID", .title = "PPID", .description = "Parent process ID", .flags = 0, .pidColumn = true, },
+   [PGRP] = { .name = "PGRP", .title = "PGRP", .description = "Process group ID", .flags = 0, .pidColumn = true, },
+   [SESSION] = { .name = "SESSION", .title = "SID", .description = "Process's session ID", .flags = 0, .pidColumn = true, },
    [TTY_NR] = { .name = "TTY_NR", .title = "    TTY ", .description = "Controlling terminal", .flags = 0, },
-   [TPGID] = { .name = "TPGID", .title = "  TPGID ", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, },
+   [TPGID] = { .name = "TPGID", .title = "TPGID", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, .pidColumn = true, },
    [MINFLT] = { .name = "MINFLT", .title = "     MINFLT ", .description = "Number of minor faults which have not required loading a memory page from disk", .flags = 0, },
    [MAJFLT] = { .name = "MAJFLT", .title = "     MAJFLT ", .description = "Number of major faults which have required loading a memory page from disk", .flags = 0, },
    [PRIORITY] = { .name = "PRIORITY", .title = "PRI ", .description = "Kernel's internal priority for the process", .flags = 0, },
@@ -54,30 +54,14 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [USER] = { .name = "USER", .title = "USER      ", .description = "Username of the process owner (or user ID if name cannot be determined)", .flags = 0, },
    [TIME] = { .name = "TIME", .title = "  TIME+  ", .description = "Total time the process has spent in user and system time", .flags = 0, },
    [NLWP] = { .name = "NLWP", .title = "NLWP ", .description = "Number of threads in the process", .flags = 0, },
-   [TGID] = { .name = "TGID", .title = "   TGID ", .description = "Thread group ID (i.e. process ID)", .flags = 0, },
-   [ZONEID] = { .name = "ZONEID", .title = " ZONEID ", .description = "Zone ID", .flags = 0, },
+   [TGID] = { .name = "TGID", .title = "TGID", .description = "Thread group ID (i.e. process ID)", .flags = 0, .pidColumn = true, },
+   [ZONEID] = { .name = "ZONEID", .title = "ZONEID", .description = "Zone ID", .flags = 0, .pidColumn = true, },
    [ZONE] = { .name = "ZONE", .title = "ZONE             ", .description = "Zone name", .flags = 0, },
-   [PROJID] = { .name = "PROJID", .title = " PRJID ", .description = "Project ID", .flags = 0, },
-   [TASKID] = { .name = "TASKID", .title = " TSKID ", .description = "Task ID", .flags = 0, },
-   [POOLID] = { .name = "POOLID", .title = " POLID ", .description = "Pool ID", .flags = 0, },
-   [CONTID] = { .name = "CONTID", .title = " CNTID ", .description = "Contract ID", .flags = 0, },
-   [LWPID] = { .name = "LWPID", .title = " LWPID ", .description = "LWP ID", .flags = 0, },
-};
-
-ProcessPidColumn Process_pidColumns[] = {
-   { .id = ZONEID, .label = "ZONEID" },
-   { .id = TASKID, .label = "TSKID" },
-   { .id = PROJID, .label = "PRJID" },
-   { .id = POOLID, .label = "POLID" },
-   { .id = CONTID, .label = "CNTID" },
-   { .id = PID, .label = "PID" },
-   { .id = PPID, .label = "PPID" },
-   { .id = LWPID, .label = "LWPID" },
-   { .id = TPGID, .label = "TPGID" },
-   { .id = TGID, .label = "TGID" },
-   { .id = PGRP, .label = "PGRP" },
-   { .id = SESSION, .label = "SID" },
-   { .id = 0, .label = NULL },
+   [PROJID] = { .name = "PROJID", .title = "PRJID", .description = "Project ID", .flags = 0, .pidColumn = true, },
+   [TASKID] = { .name = "TASKID", .title = "TSKID", .description = "Task ID", .flags = 0, .pidColumn = true, },
+   [POOLID] = { .name = "POOLID", .title = "POLID", .description = "Pool ID", .flags = 0, .pidColumn = true, },
+   [CONTID] = { .name = "CONTID", .title = "CNTID", .description = "Contract ID", .flags = 0, .pidColumn = true, },
+   [LWPID] = { .name = "LWPID", .title = "LWPID", .description = "LWP ID", .flags = 0, .pidColumn = true, },
 };
 
 Process* SolarisProcess_new(const Settings* settings) {
@@ -101,15 +85,15 @@ void SolarisProcess_writeField(const Process* this, RichString* str, ProcessFiel
    int n = sizeof(buffer) - 1;
    switch (field) {
    // add Solaris-specific fields here
-   case ZONEID: xSnprintf(buffer, n, Process_pidFormat, sp->zoneid); break;
-   case PROJID: xSnprintf(buffer, n, Process_pidFormat, sp->projid); break;
-   case TASKID: xSnprintf(buffer, n, Process_pidFormat, sp->taskid); break;
-   case POOLID: xSnprintf(buffer, n, Process_pidFormat, sp->poolid); break;
-   case CONTID: xSnprintf(buffer, n, Process_pidFormat, sp->contid); break;
+   case ZONEID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->zoneid); break;
+   case PROJID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->projid); break;
+   case TASKID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->taskid); break;
+   case POOLID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->poolid); break;
+   case CONTID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->contid); break;
    case ZONE: xSnprintf(buffer, n, "%-*s ", ZONENAME_MAX/4, sp->zname); break;
-   case PID: xSnprintf(buffer, n, Process_pidFormat, sp->realpid); break;
-   case PPID: xSnprintf(buffer, n, Process_pidFormat, sp->realppid); break;
-   case LWPID: xSnprintf(buffer, n, Process_pidFormat, sp->lwpid); break;
+   case PID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->realpid); break;
+   case PPID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->realppid); break;
+   case LWPID: xSnprintf(buffer, n, "%*d ", Process_pidDigits, sp->lwpid); break;
    default:
       Process_writeField(this, str, field);
       return;
diff --git a/solaris/SolarisProcess.h b/solaris/SolarisProcess.h
index 5f79754a..0f1cb46c 100644
--- a/solaris/SolarisProcess.h
+++ b/solaris/SolarisProcess.h
@@ -34,9 +34,7 @@ typedef struct SolarisProcess_ {
 
 extern const ProcessClass SolarisProcess_class;
 
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
-
-extern ProcessPidColumn Process_pidColumns[];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
 
 Process* SolarisProcess_new(const Settings* settings);
 
diff --git a/unsupported/Platform.c b/unsupported/Platform.c
index 75b00502..b435e186 100644
--- a/unsupported/Platform.c
+++ b/unsupported/Platform.c
@@ -59,10 +59,6 @@ const MeterClass* const Platform_meterTypes[] = {
    NULL
 };
 
-ProcessPidColumn Process_pidColumns[] = {
-   { .id = 0, .label = NULL },
-};
-
 void Platform_init(void) {
    /* no platform-specific setup needed */
 }
diff --git a/unsupported/Platform.h b/unsupported/Platform.h
index 7ba5f063..5f777381 100644
--- a/unsupported/Platform.h
+++ b/unsupported/Platform.h
@@ -23,10 +23,6 @@ extern ProcessField Platform_defaultFields[];
 
 extern const MeterClass* const Platform_meterTypes[];
 
-extern char Process_pidFormat[20];
-
-extern ProcessPidColumn Process_pidColumns[];
-
 void Platform_init(void);
 
 void Platform_done(void);
diff --git a/unsupported/UnsupportedProcess.c b/unsupported/UnsupportedProcess.c
index 153f86f6..eb52910b 100644
--- a/unsupported/UnsupportedProcess.c
+++ b/unsupported/UnsupportedProcess.c
@@ -9,16 +9,16 @@ in the source distribution for its full text.
 #include "UnsupportedProcess.h"
 #include <stdlib.h>
 
-ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [0] = { .name = "", .title = NULL, .description = NULL, .flags = 0, },
-   [PID] = { .name = "PID", .title = "    PID ", .description = "Process/thread ID", .flags = 0, },
+   [PID] = { .name = "PID", .title = "PID", .description = "Process/thread ID", .flags = 0, .pidColumn = true, },
    [COMM] = { .name = "Command", .title = "Command ", .description = "Command line", .flags = 0, },
    [STATE] = { .name = "STATE", .title = "S ", .description = "Process state (S sleeping, R running, D disk, Z zombie, T traced, W paging)", .flags = 0, },
-   [PPID] = { .name = "PPID", .title = "   PPID ", .description = "Parent process ID", .flags = 0, },
-   [PGRP] = { .name = "PGRP", .title = "   PGRP ", .description = "Process group ID", .flags = 0, },
-   [SESSION] = { .name = "SESSION", .title = "    SID ", .description = "Process's session ID", .flags = 0, },
+   [PPID] = { .name = "PPID", .title = "PPID", .description = "Parent process ID", .flags = 0, .pidColumn = true, },
+   [PGRP] = { .name = "PGRP", .title = "PGRP", .description = "Process group ID", .flags = 0, .pidColumn = true, },
+   [SESSION] = { .name = "SESSION", .title = "SID", .description = "Process's session ID", .flags = 0, .pidColumn = true, },
    [TTY_NR] = { .name = "TTY_NR", .title = "    TTY ", .description = "Controlling terminal", .flags = 0, },
-   [TPGID] = { .name = "TPGID", .title = "  TPGID ", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, },
+   [TPGID] = { .name = "TPGID", .title = "TPGID", .description = "Process ID of the fg process group of the controlling terminal", .flags = 0, .pidColumn = true, },
    [MINFLT] = { .name = "MINFLT", .title = "     MINFLT ", .description = "Number of minor faults which have not required loading a memory page from disk", .flags = 0, },
    [MAJFLT] = { .name = "MAJFLT", .title = "     MAJFLT ", .description = "Number of major faults which have required loading a memory page from disk", .flags = 0, },
    [PRIORITY] = { .name = "PRIORITY", .title = "PRI ", .description = "Kernel's internal priority for the process", .flags = 0, },
@@ -34,7 +34,7 @@ ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [USER] = { .name = "USER", .title = "USER      ", .description = "Username of the process owner (or user ID if name cannot be determined)", .flags = 0, },
    [TIME] = { .name = "TIME", .title = "  TIME+  ", .description = "Total time the process has spent in user and system time", .flags = 0, },
    [NLWP] = { .name = "NLWP", .title = "NLWP ", .description = "Number of threads in the process", .flags = 0, },
-   [TGID] = { .name = "TGID", .title = "   TGID ", .description = "Thread group ID (i.e. process ID)", .flags = 0, },
+   [TGID] = { .name = "TGID", .title = "TGID", .description = "Thread group ID (i.e. process ID)", .flags = 0, .pidColumn = true, },
 };
 
 Process* UnsupportedProcess_new(Settings* settings) {
diff --git a/unsupported/UnsupportedProcess.h b/unsupported/UnsupportedProcess.h
index a9be326e..e1812f16 100644
--- a/unsupported/UnsupportedProcess.h
+++ b/unsupported/UnsupportedProcess.h
@@ -11,7 +11,7 @@ in the source distribution for its full text.
 
 #define Process_delete UnsupportedProcess_delete
 
-extern ProcessFieldData Process_fields[LAST_PROCESSFIELD];
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
 
 Process* UnsupportedProcess_new(Settings* settings);