diff --git a/src/libs/vwidgets/vabstractmainwindow.cpp b/src/libs/vwidgets/vabstractmainwindow.cpp
index d26b64db2..0eb3f564a 100644
--- a/src/libs/vwidgets/vabstractmainwindow.cpp
+++ b/src/libs/vwidgets/vabstractmainwindow.cpp
@@ -42,6 +42,10 @@
 #include <QLockFile>
 #include <QMessageBox>
 
+#ifdef Q_OS_WIN
+extern Q_CORE_EXPORT int qt_ntfs_permission_lookup;
+#endif /*Q_OS_WIN*/
+
 #if defined(Q_OS_MAC)
 #include <QStyleFactory>
 #endif