diff --git a/effects.cpp b/effects.cpp
index 9b5653df90..78b1eb8d11 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -347,7 +347,7 @@ void EffectsHandlerImpl::grabbedKeyboardEvent( QKeyEvent* e )
         keyboard_grab_effect->grabbedKeyboardEvent( e );
     }
 
-const void* EffectsHandlerImpl::getProxy( QString name )
+void* EffectsHandlerImpl::getProxy( QString name )
     {
     // All effects start with "kwin4_effect_", prepend it to the name
     name.prepend( "kwin4_effect_" );
diff --git a/effects.h b/effects.h
index 3b611f1d40..e588555e91 100644
--- a/effects.h
+++ b/effects.h
@@ -83,7 +83,7 @@ class EffectsHandlerImpl : public EffectsHandler
         virtual QPoint cursorPos() const;
         virtual bool grabKeyboard( Effect* effect );
         virtual void ungrabKeyboard();
-        virtual const void* getProxy( QString name );
+        virtual void* getProxy( QString name );
         virtual void startMousePolling();
         virtual void stopMousePolling();
         virtual EffectWindow* findWindow( WId id ) const;
diff --git a/effects/desktopgrid/desktopgrid.cpp b/effects/desktopgrid/desktopgrid.cpp
index 886a709fd5..c83e3962d8 100644
--- a/effects/desktopgrid/desktopgrid.cpp
+++ b/effects/desktopgrid/desktopgrid.cpp
@@ -776,8 +776,8 @@ void DesktopGridEffect::setActive( bool active )
         return; // Already in that state
 
     // Example proxy code, TODO: Use or remove
-    //const PresentWindowsEffectProxy* proxy =
-    //    static_cast<const PresentWindowsEffectProxy*>( effects->getProxy( "presentwindows" ));
+    //PresentWindowsEffectProxy* proxy =
+    //    static_cast<PresentWindowsEffectProxy*>( effects->getProxy( "presentwindows" ));
     //if( proxy )
     //    kDebug() << "Retrieved PresentWindowsEffectProxy, is present windows activate?"
     //             << proxy->isActive();
diff --git a/effects/presentwindows/presentwindows.cpp b/effects/presentwindows/presentwindows.cpp
index 4dab835b5a..be8104ded5 100644
--- a/effects/presentwindows/presentwindows.cpp
+++ b/effects/presentwindows/presentwindows.cpp
@@ -154,7 +154,7 @@ void PresentWindowsEffect::reconfigure( ReconfigureFlags )
     m_rightButtonDesktop = (DesktopMouseAction)conf.readEntry( "RightButtonDesktop", (int)DesktopNoAction );
     }
 
-const void* PresentWindowsEffect::proxy() const
+void* PresentWindowsEffect::proxy()
     {
     return &m_proxy;
     }
diff --git a/effects/presentwindows/presentwindows.h b/effects/presentwindows/presentwindows.h
index 125e87ab78..70ebbfe5b1 100644
--- a/effects/presentwindows/presentwindows.h
+++ b/effects/presentwindows/presentwindows.h
@@ -64,7 +64,7 @@ class PresentWindowsEffect
         virtual ~PresentWindowsEffect();
 
         virtual void reconfigure( ReconfigureFlags );
-        virtual const void* proxy() const;
+        virtual void* proxy();
 
         // Screen painting
         virtual void prePaintScreen( ScreenPrePaintData &data, int time );
diff --git a/lib/kwineffects.cpp b/lib/kwineffects.cpp
index e52dd2b185..0d02bd6e8e 100644
--- a/lib/kwineffects.cpp
+++ b/lib/kwineffects.cpp
@@ -114,7 +114,7 @@ void Effect::reconfigure( ReconfigureFlags )
     {
     }
 
-const void* Effect::proxy() const
+void* Effect::proxy()
     {
     return NULL;
     }
diff --git a/lib/kwineffects.h b/lib/kwineffects.h
index df547a96cb..ad9aa97048 100644
--- a/lib/kwineffects.h
+++ b/lib/kwineffects.h
@@ -170,7 +170,7 @@ X-KDE-Library=kwin4_effect_cooleffect
 
 #define KWIN_EFFECT_API_MAKE_VERSION( major, minor ) (( major ) << 8 | ( minor ))
 #define KWIN_EFFECT_API_VERSION_MAJOR 0
-#define KWIN_EFFECT_API_VERSION_MINOR 102
+#define KWIN_EFFECT_API_VERSION_MINOR 103
 #define KWIN_EFFECT_API_VERSION KWIN_EFFECT_API_MAKE_VERSION( \
     KWIN_EFFECT_API_VERSION_MAJOR, KWIN_EFFECT_API_VERSION_MINOR )
 
@@ -309,7 +309,7 @@ class KWIN_EXPORT Effect
         /**
          * Called when another effect requests the proxy for this effect.
          */
-        virtual const void* proxy() const;
+        virtual void* proxy();
 
         /**
          * Called before starting to paint the screen.
@@ -541,7 +541,7 @@ class KWIN_EXPORT EffectsHandler
          * Retrieve the proxy class for an effect if it has one. Will return NULL if
          * the effect isn't loaded or doesn't have a proxy class.
          */
-        virtual const void* getProxy( QString name ) = 0;
+        virtual void* getProxy( QString name ) = 0;
 
         // Mouse polling
         virtual void startMousePolling() = 0;