diff --git a/src/system/kernel/scheduler/scheduler_thread.h b/src/system/kernel/scheduler/scheduler_thread.h
index b5fa05cff3..200266c8b8 100644
--- a/src/system/kernel/scheduler/scheduler_thread.h
+++ b/src/system/kernel/scheduler/scheduler_thread.h
@@ -394,8 +394,7 @@ ThreadData::Enqueue()
 	SCHEDULER_ENTER_FUNCTION();
 
 	if (!fReady) {
-		ASSERT(system_time() - fWentSleep >= 0);
-		if (gTrackCoreLoad) {
+		if (gTrackCoreLoad && system_time() - fWentSleep > 0) {
 			fMeasureAvailableTime += system_time() - fWentSleep;
 
 			fCore->UpdateLoad(fNeededLoad);