diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index 70f77676..006d7ab1 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -1218,6 +1218,9 @@ int sigar_proc_state_get(sigar_t *sigar, sigar_pid_t pid,
         procstate->state = 'D';
         break;
       case SRUN:
+#ifdef SONPROC
+      case SONPROC:
+#endif
         procstate->state = 'R';
         break;
       case SSLEEP:
@@ -1229,6 +1232,9 @@ int sigar_proc_state_get(sigar_t *sigar, sigar_pid_t pid,
       case SZOMB:
         procstate->state = 'Z';
         break;
+      default:
+        procstate->state = '?';
+        break;
     }
 
     return SIGAR_OK;