diff --git a/src_main/system/pisystemmonitor.cpp b/src_main/system/pisystemmonitor.cpp
index 6c5a463f..7f734fdb 100755
--- a/src_main/system/pisystemmonitor.cpp
+++ b/src_main/system/pisystemmonitor.cpp
@@ -57,6 +57,7 @@ PISystemMonitor::PISystemMonitor(): PIThread() {
 	self_ = false;
 	pID_ = cycle = 0;
 	cpu_count = PISystemInfo::instance()->processorsCount;
+#ifndef FREERTOS
 #ifndef WINDOWS
 #  ifdef QNX
 	page_size = 4096;
@@ -66,6 +67,7 @@ PISystemMonitor::PISystemMonitor(): PIThread() {
 #else
 	PRIVATE->hProc = 0;
 	PRIVATE->mem_cnt.cb = sizeof(PRIVATE->mem_cnt);
+#endif
 #endif
 	setName("system_monitor");
 }