diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index e2500c1b..747e71d9 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -476,9 +476,9 @@ int sigar_cpu_get(sigar_t *sigar, sigar_cpu_t *cpu)
 
     cpu->user = cp_time[CP_USER];
     cpu->nice = cp_time[CP_NICE];
-    cpu->sys  = cp_time[CP_SYS];
+    cpu->sys  = cp_time[CP_SYS] + cp_time[CP_INTR];
     cpu->idle = cp_time[CP_IDLE];
-    cpu->wait = cp_time[CP_INTR];
+    cpu->wait = 0; /*N/A*/
     cpu->total = cpu->user + cpu->nice + cpu->sys + cpu->idle;
 #endif