diff --git a/tests/auto/widgets/widgets/qmainwindow/tst_qmainwindow.cpp b/tests/auto/widgets/widgets/qmainwindow/tst_qmainwindow.cpp
index bf0f58587a4..09d3eb1e8df 100644
--- a/tests/auto/widgets/widgets/qmainwindow/tst_qmainwindow.cpp
+++ b/tests/auto/widgets/widgets/qmainwindow/tst_qmainwindow.cpp
@@ -1657,8 +1657,8 @@ struct AddDockWidget
     QString name;
     Mode mode;
 
-    Qt::Orientation o;
-    Qt::DockWidgetArea a;
+    Qt::Orientation o = {};
+    Qt::DockWidgetArea a = {};
     QString other;
 
     void apply(QMainWindow *mw) const;