diff --git a/kdecore/netwm.cpp b/kdecore/netwm.cpp
index 6ca557532..455b6db65 100644
--- a/kdecore/netwm.cpp
+++ b/kdecore/netwm.cpp
@@ -26,6 +26,7 @@
 //#define NETWMDEBUG
 
 #include <tqwidget.h>
+#include <tqapplication.h>
 #ifdef Q_WS_X11 //FIXME
 
 #include "netwm.h"