1 files changed, 2 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
index f7320388f7..8aadabd227 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
@@ -47,6 +47,7 @@
 
 #include <QtCore/qpointer.h>
 #include <QtCore/qsharedpointer.h>
+#include <QtCore/qmutex.h>
 #include <QtCore/qt_windows.h>
 #include <QtGui/qaccessible.h>
 
@@ -98,6 +99,7 @@ public:
 private:
     QString automationIdForAccessible(const QAccessibleInterface *accessible);
     ULONG m_ref;
+    static QMutex m_mutex;
 };
 
 QT_END_NAMESPACE