diff --git a/effects/shadow.cpp b/effects/shadow.cpp
index 20e2fa2d73..be016fe431 100644
--- a/effects/shadow.cpp
+++ b/effects/shadow.cpp
@@ -109,6 +109,14 @@ void ShadowEffect::drawWindow( EffectWindow* w, int mask, QRegion region, Window
     effects->drawWindow( w, mask, region, data );
     }
 
+QRect ShadowEffect::transformWindowDamage( EffectWindow* w, const QRect& r )
+    {
+    if( !useShadow( w ))
+        return effects->transformWindowDamage( w, r );
+    QRect r2 = r | shadowRectangle( r );
+    return effects->transformWindowDamage( w, r2 );
+    }
+
 void ShadowEffect::windowClosed( EffectWindow* c )
     {
     effects->addRepaint( shadowRectangle( c->geometry() ));
diff --git a/effects/shadow.h b/effects/shadow.h
index f3a54d8739..84c63c855a 100644
--- a/effects/shadow.h
+++ b/effects/shadow.h
@@ -38,6 +38,7 @@ class ShadowEffect
         virtual void drawWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data );
         virtual void paintScreen( int mask, QRegion region, ScreenPaintData& data );
         virtual void windowClosed( EffectWindow* c );
+        virtual QRect transformWindowDamage( EffectWindow* w, const QRect& r );
     private:
         void drawShadow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data, bool clip );
         void addQuadVertices(QVector<float>& verts, float x1, float y1, float x2, float y2) const;