diff --git a/effects/diminactive/diminactive.cpp b/effects/diminactive/diminactive.cpp
index 9cfe990978..2e5b6f8375 100644
--- a/effects/diminactive/diminactive.cpp
+++ b/effects/diminactive/diminactive.cpp
@@ -97,6 +97,12 @@ bool DimInactiveEffect::dimWindow( const EffectWindow* w ) const
     return true; // dim the rest
     }
 
+void DimInactiveEffect::windowDeleted( EffectWindow* w )
+    {
+    if( w == previousActive )
+        previousActive = NULL;
+    }
+
 void DimInactiveEffect::windowActivated( EffectWindow* w )
     {
     if( active != NULL )
diff --git a/effects/diminactive/diminactive.h b/effects/diminactive/diminactive.h
index 9111254c38..ff3915c451 100644
--- a/effects/diminactive/diminactive.h
+++ b/effects/diminactive/diminactive.h
@@ -37,6 +37,7 @@ class DimInactiveEffect
         virtual void reconfigure( ReconfigureFlags );
         virtual void prePaintScreen( ScreenPrePaintData& data, int time );
         virtual void paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data );
+        virtual void windowDeleted( EffectWindow* w );
         virtual void windowActivated( EffectWindow* c );
     private:
         bool dimWindow( const EffectWindow* w ) const;