diff --git a/clients/default/config/config.h b/clients/default/config/config.h
index d105f19171..4cda567fe3 100644
--- a/clients/default/config/config.h
+++ b/clients/default/config/config.h
@@ -14,7 +14,6 @@
 #include <qgroupbox.h>
 #include <kconfig.h>
 #include <qlabel.h>
-#include <Qt3Support/q3vbox.h>
 #include <kvbox.h>
 
 class KDEDefaultConfig: public QObject
diff --git a/clients/modernsystem/config/config.h b/clients/modernsystem/config/config.h
index 9b99fd0525..34962a2137 100644
--- a/clients/modernsystem/config/config.h
+++ b/clients/modernsystem/config/config.h
@@ -2,7 +2,6 @@
 #define __KDE_MODSYSTEMCONFIG_H
 
 #include <qcheckbox.h>
-#include <q3groupbox.h>
 #include <qlayout.h>
 
 #include <qslider.h>
diff --git a/kcmkwin/kwinrules/detectwidget.h b/kcmkwin/kwinrules/detectwidget.h
index 9d79a08f22..8f64bb9144 100644
--- a/kcmkwin/kwinrules/detectwidget.h
+++ b/kcmkwin/kwinrules/detectwidget.h
@@ -24,7 +24,6 @@
 
 #include <kdialogbase.h>
 #include <kwin.h>
-#include <q3cstring.h>
 
 #include "../../rules.h"
 //Added by qt3to4: