diff --git a/packages/rtl-objpas/src/inc/fpmonitor.pp b/packages/rtl-objpas/src/inc/fpmonitor.pp
index 364f26674e..014b241f87 100644
--- a/packages/rtl-objpas/src/inc/fpmonitor.pp
+++ b/packages/rtl-objpas/src/inc/fpmonitor.pp
@@ -247,7 +247,7 @@ begin
          TimeToSleep:=SleepTime[Stage];
          if aTimeout<TimeToSleep then
            TimeToSleep:=aTimeout;
-         SysUtils.Sleep(TimeToSleep);
+         Sleep(TimeToSleep);
          end;
      end;
      TimeB:=GetTickCount64;