diff --git a/Process.c b/Process.c
index 7ea2c4af..8245f86d 100644
--- a/Process.c
+++ b/Process.c
@@ -223,7 +223,7 @@ static inline void Process_writeCommand(const Process* this, int attr, int basea
    }
 }
 
-void Process_outputRate(RichString* str, char* buffer, int n, double rate, int coloring) {
+void Process_outputRate(RichString* str, char* buffer, size_t n, double rate, int coloring) {
    int largeNumberColor = CRT_colors[LARGE_NUMBER];
    int processMegabytesColor = CRT_colors[PROCESS_MEGABYTES];
    int processColor = CRT_colors[PROCESS];
@@ -258,7 +258,7 @@ void Process_writeField(const Process* this, RichString* str, ProcessField field
    char buffer[256]; buffer[255] = '\0';
    int attr = CRT_colors[DEFAULT_COLOR];
    int baseattr = CRT_colors[PROCESS_BASENAME];
-   int n = sizeof(buffer) - 1;
+   size_t n = sizeof(buffer) - 1;
    bool coloring = this->settings->highlightMegabytes;
 
    switch (field) {
@@ -312,7 +312,7 @@ void Process_writeField(const Process* this, RichString* str, ProcessField field
             } else {
                ret = snprintf(buf, n, "   ");
             }
-            if (ret < 0 || ret >= n) {
+            if (ret < 0 || (size_t)ret >= n) {
                written = n;
             } else {
                written = ret;
diff --git a/Process.h b/Process.h
index 7a68c69f..48e31b1d 100644
--- a/Process.h
+++ b/Process.h
@@ -176,7 +176,7 @@ void Process_printTime(RichString* str, unsigned long long totalHundredths);
 
 void Process_fillStarttimeBuffer(Process* this);
 
-void Process_outputRate(RichString* str, char* buffer, int n, double rate, int coloring);
+void Process_outputRate(RichString* str, char* buffer, size_t n, double rate, int coloring);
 
 void Process_display(const Object* cast, RichString* out);
 
diff --git a/linux/LinuxProcess.c b/linux/LinuxProcess.c
index f51cf1e3..8298000a 100644
--- a/linux/LinuxProcess.c
+++ b/linux/LinuxProcess.c
@@ -618,7 +618,7 @@ static void LinuxProcess_writeField(const Process* this, RichString* str, Proces
    bool coloring = this->settings->highlightMegabytes;
    char buffer[256]; buffer[255] = '\0';
    int attr = CRT_colors[DEFAULT_COLOR];
-   int n = sizeof(buffer) - 1;
+   size_t n = sizeof(buffer) - 1;
    switch ((int)field) {
    case TTY_NR: {
       if (lp->ttyDevice) {