diff --git a/tests/auto/gui/kernel/qwindow/tst_qwindow.cpp b/tests/auto/gui/kernel/qwindow/tst_qwindow.cpp
index 8c4c53cc5c..a860793ce4 100644
--- a/tests/auto/gui/kernel/qwindow/tst_qwindow.cpp
+++ b/tests/auto/gui/kernel/qwindow/tst_qwindow.cpp
@@ -45,6 +45,9 @@
 
 #include <QEvent>
 
+// For QSignalSpy slot connections.
+Q_DECLARE_METATYPE(Qt::ScreenOrientation)
+
 class tst_QWindow: public QObject
 {
     Q_OBJECT