diff --git a/src_main/system/pisystemmonitor.cpp b/src_main/system/pisystemmonitor.cpp
index a7429769..fdb63fd4 100755
--- a/src_main/system/pisystemmonitor.cpp
+++ b/src_main/system/pisystemmonitor.cpp
@@ -112,7 +112,7 @@ bool PISystemMonitor::startOnProcess(int pID, int interval_ms) {
 #endif
 
 bool PISystemMonitor::startOnSelf(int interval_ms) {
-#ifdef FREERTOS
+#ifndef FREERTOS
 	bool ret = startOnProcess(PIProcess::currentPID(), interval_ms);
 #else
 	self_ = false;