diff --git a/src/dbus/qdbusconnection.h b/src/dbus/qdbusconnection.h
index 66fb514865..59f6429d4f 100644
--- a/src/dbus/qdbusconnection.h
+++ b/src/dbus/qdbusconnection.h
@@ -35,6 +35,7 @@
 #define QDBUSCONNECTION_H
 
 #include <QtDBus/qdbusmacros.h>
+#include <QtCore/qobjectdefs.h>
 #include <QtCore/qstring.h>
 
 #ifndef QT_NO_DBUS