diff --git a/components/sceneutil/workqueue.cpp b/components/sceneutil/workqueue.cpp
index 9f23fba2dd..b642687f0f 100644
--- a/components/sceneutil/workqueue.cpp
+++ b/components/sceneutil/workqueue.cpp
@@ -17,8 +17,10 @@ void WorkTicket::waitTillDone()
 
 void WorkTicket::signalDone()
 {
-    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mMutex);
-    mDone.exchange(1);
+    {
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mMutex);
+        mDone.exchange(1);
+    }
     mCondition.broadcast();
 }