diff --git a/src/plugins/platforms/wayland/qwaylandwindow_p.h b/src/plugins/platforms/wayland/qwaylandwindow_p.h
index 8e0843d89eb..218dff15647 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow_p.h
+++ b/src/plugins/platforms/wayland/qwaylandwindow_p.h
@@ -312,7 +312,7 @@ protected:
     QWaitCondition mFrameSyncWait;
 
     // True when we have called deliverRequestUpdate, but the client has not yet attached a new buffer
-    bool mWaitingForUpdate = false;
+    std::atomic_bool mWaitingForUpdate = false;
     bool mExposed = false;
 
     // written from the main thread, read by the render thread