diff --git a/src/corelib/thread/qthread_p.h b/src/corelib/thread/qthread_p.h
index d6fd99e5ba2..4918fd7b852 100644
--- a/src/corelib/thread/qthread_p.h
+++ b/src/corelib/thread/qthread_p.h
@@ -187,7 +187,7 @@ public:
     bool running;
     bool finished;
     bool isInFinish; //when in QThreadPrivate::finish
-    std::atomic<bool> interruptionRequested;
+    std::atomic<bool> interruptionRequested = false;
 
     bool exited;
     int returnCode;