diff --git a/effects.cpp b/effects.cpp
index 9c22c2970d..bae4d44236 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -47,6 +47,10 @@ void Effect::windowUserMovedResized( EffectWindow* , bool, bool )
     {
     }
 
+void Effect::windowOpacityChanged( EffectWindow* )
+    {
+    }
+
 void Effect::windowAdded( EffectWindow* )
     {
     }
@@ -162,6 +166,12 @@ void EffectsHandler::windowUserMovedResized( EffectWindow* c, bool first, bool l
         ep.second->windowUserMovedResized( c, first, last );
     }
 
+void EffectsHandler::windowOpacityChanged( EffectWindow* c )
+    {
+    foreach( EffectPair ep, loaded_effects )
+        ep.second->windowOpacityChanged( c );
+    }
+
 void EffectsHandler::windowAdded( EffectWindow* c )
     {
     foreach( EffectPair ep, loaded_effects )
diff --git a/effects.h b/effects.h
index f18396690d..57b54ce7f3 100644
--- a/effects.h
+++ b/effects.h
@@ -73,6 +73,7 @@ class Effect
         virtual void postPaintWindow( EffectWindow* w );
         // called when moved/resized or once after it's finished
         virtual void windowUserMovedResized( EffectWindow* c, bool first, bool last );
+        virtual void windowOpacityChanged( EffectWindow* c );
         virtual void windowAdded( EffectWindow* c );
         virtual void windowClosed( EffectWindow* c );
         virtual void windowDeleted( EffectWindow* c );
@@ -137,6 +138,7 @@ class EffectsHandler
         // internal (used by kwin core or compositing code)
         void startPaint();
         void windowUserMovedResized( EffectWindow* c, bool first, bool last );
+        void windowOpacityChanged( EffectWindow* c );
         void windowAdded( EffectWindow* c );
         void windowClosed( EffectWindow* c );
         void windowDeleted( EffectWindow* c );
diff --git a/events.cpp b/events.cpp
index 5c71f64198..40944081e4 100644
--- a/events.cpp
+++ b/events.cpp
@@ -597,6 +597,8 @@ bool Client::windowEvent( XEvent* e )
                 {
                 addDamageFull();
                 scene->windowOpacityChanged( this );
+                if( effects )
+                    effects->windowOpacityChanged( effectWindow());
                 }
             else
                 { // forward to the frame if there's possibly another compositing manager running
@@ -1606,6 +1608,8 @@ bool Unmanaged::windowEvent( XEvent* e )
     if( dirty[ NETWinInfo::PROTOCOLS2 ] & NET::WM2Opacity )
         {
         scene->windowOpacityChanged( this );
+        if( effects )
+            effects->windowOpacityChanged( effectWindow());
         addDamageFull();
         }
     switch (e->type)