diff --git a/src_main/system/pisystemmonitor.cpp b/src_main/system/pisystemmonitor.cpp
index fdb63fd4..6c5a463f 100755
--- a/src_main/system/pisystemmonitor.cpp
+++ b/src_main/system/pisystemmonitor.cpp
@@ -117,7 +117,7 @@ bool PISystemMonitor::startOnSelf(int interval_ms) {
 #else
 	self_ = false;
 	cycle = -1;
-	ret = start(interval_ms);
+	bool ret = start(interval_ms);
 #endif
 	self_ = true;
 	return ret;