diff --git a/appshell/cef_dark_aero_window.cpp b/appshell/cef_dark_aero_window.cpp
index 37cc707f4..f61a2d2f4 100644
--- a/appshell/cef_dark_aero_window.cpp
+++ b/appshell/cef_dark_aero_window.cpp
@@ -816,7 +816,7 @@ LRESULT cef_dark_aero_window::WindowProc(UINT message, WPARAM wParam, LPARAM lPa
         if (mReady) {
             UpdateNonClientArea();
         }
-        break;
+        return 0L;
     case WM_NCMOUSELEAVE:
         // NOTE: We want anyone else interested in this message
         //          to be notified. Otherwise the default implementation