diff --git a/src/plugins/platforms/cocoa/qcocoansmenu.mm b/src/plugins/platforms/cocoa/qcocoansmenu.mm
index 84a625ed66f..4bc9b0b5f90 100644
--- a/src/plugins/platforms/cocoa/qcocoansmenu.mm
+++ b/src/plugins/platforms/cocoa/qcocoansmenu.mm
@@ -13,6 +13,7 @@
 
 #include <QtCore/qcoreapplication.h>
 #include <QtCore/qcoreevent.h>
+#include <QtCore/qvarlengtharray.h>
 #include <QtGui/private/qapplekeymapper_p.h>
 
 static NSString *qt_mac_removePrivateUnicode(NSString *string)