diff --git a/effects/demo_liquid.cpp b/effects/demo_liquid.cpp
index 2808eff490..766a1f7d7b 100644
--- a/effects/demo_liquid.cpp
+++ b/effects/demo_liquid.cpp
@@ -13,7 +13,7 @@ License. See the file "COPYING" for the exact licensing terms.
 
 #include <kwinglutils.h>
 
-#include <QString>
+
 #include <KStandardDirs>
 
 #include <kdebug.h>
diff --git a/effects/explosioneffect.cpp b/effects/explosioneffect.cpp
index aa5a267625..38cd4b1fa3 100644
--- a/effects/explosioneffect.cpp
+++ b/effects/explosioneffect.cpp
@@ -13,7 +13,7 @@ License. See the file "COPYING" for the exact licensing terms.
 
 #include <kwinglutils.h>
 
-#include <QString>
+
 #include <KStandardDirs>
 #include <kdebug.h>
 
diff --git a/lib/kdecoration_plugins_p.h b/lib/kdecoration_plugins_p.h
index 2b33cbf9bb..885f06282c 100644
--- a/lib/kdecoration_plugins_p.h
+++ b/lib/kdecoration_plugins_p.h
@@ -30,7 +30,7 @@ DEALINGS IN THE SOFTWARE.
 // This header file is internal. I mean it.
 // 
 
-#include <QString>
+
 #include <QWidget>
 #include <ksharedconfig.h>
 
diff --git a/lib/kwineffects.h b/lib/kwineffects.h
index 885edb9e8f..a9d3c416e9 100644
--- a/lib/kwineffects.h
+++ b/lib/kwineffects.h
@@ -18,7 +18,7 @@ License. See the file "COPYING" for the exact licensing terms.
 #include <qpair.h>
 #include <QRect>
 #include <QRegion>
-#include <QString>
+
 #include <QVector>
 #include <QList>
 #include <QHash>
diff --git a/lib/kwinglutils.cpp b/lib/kwinglutils.cpp
index e1d41b27e5..bb8fa17ae0 100644
--- a/lib/kwinglutils.cpp
+++ b/lib/kwinglutils.cpp
@@ -19,7 +19,7 @@ License. See the file "COPYING" for the exact licensing terms.
 #include <QImage>
 #include <QHash>
 #include <QFile>
-#include <QString>
+
 
 
 #define MAKE_GL_VERSION(major, minor, release)  ( ((major) << 16) | ((minor) << 8) | (release) )
diff --git a/lib/kwinglutils.h b/lib/kwinglutils.h
index 8f0216ac11..46086f15c0 100644
--- a/lib/kwinglutils.h
+++ b/lib/kwinglutils.h
@@ -20,7 +20,7 @@ License. See the file "COPYING" for the exact licensing terms.
 #endif
 
 #include <QPixmap>
-#include <QString>
+
 #include <QImage>
 #include <QSize>
 
diff --git a/rules.h b/rules.h
index fdf71ba7b8..d2430f1600 100644
--- a/rules.h
+++ b/rules.h
@@ -11,7 +11,7 @@ License. See the file "COPYING" for the exact licensing terms.
 #ifndef KWIN_RULES_H
 #define KWIN_RULES_H
 
-#include <QString>
+
 #include <netwm_def.h>
 #include <QRect>
 #include <kconfiggroup.h>