diff --git a/darwin/DarwinProcessList.c b/darwin/DarwinProcessList.c
index d45ac09c..47904beb 100644
--- a/darwin/DarwinProcessList.c
+++ b/darwin/DarwinProcessList.c
@@ -16,6 +16,7 @@ in the source distribution for its full text.
 #include <libproc.h>
 #include <sys/mman.h>
 #include <utmpx.h>
+#include <err.h>
 
 /*{
 #include "ProcessList.h"
diff --git a/darwin/Platform.c b/darwin/Platform.c
index f8108e78..da9cbb75 100644
--- a/darwin/Platform.c
+++ b/darwin/Platform.c
@@ -167,7 +167,10 @@ ProcessPidColumn Process_pidColumns[] = {
 static double Platform_setCPUAverageValues(Meter* mtr) {
    DarwinProcessList *dpl = (DarwinProcessList *)mtr->pl;
    int cpus = dpl->super.cpuCount;
-   double sumNice, sumNormal, sumKernel, sumPercent;
+   double sumNice = 0.0;
+   double sumNormal = 0.0;
+   double sumKernel = 0.0;
+   double sumPercent = 0.0;
    for (int i = 1; i <= cpus; i++) {
       sumPercent += Platform_setCPUValues(mtr, i);
       sumNice    += mtr->values[CPU_METER_NICE];