diff --git a/effects/cube/cube.h b/effects/cube/cube.h
index a897649806..43f256cdd2 100644
--- a/effects/cube/cube.h
+++ b/effects/cube/cube.h
@@ -34,7 +34,7 @@ namespace KWin
 {
 
 class CubeEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/cube/cubeslide.h b/effects/cube/cubeslide.h
index a61c16693a..b1ff4a29ed 100644
--- a/effects/cube/cubeslide.h
+++ b/effects/cube/cubeslide.h
@@ -31,6 +31,7 @@ namespace KWin
 class CubeSlideEffect
     : public Effect
 {
+    Q_OBJECT
 public:
     CubeSlideEffect();
     ~CubeSlideEffect();
diff --git a/effects/desktopgrid/desktopgrid.h b/effects/desktopgrid/desktopgrid.h
index 9c192271c8..76ea364bcf 100644
--- a/effects/desktopgrid/desktopgrid.h
+++ b/effects/desktopgrid/desktopgrid.h
@@ -59,7 +59,7 @@ private:
 };
 
 class DesktopGridEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/fadedesktop/fadedesktop.h b/effects/fadedesktop/fadedesktop.h
index 81cac9ff21..6f39220a1c 100644
--- a/effects/fadedesktop/fadedesktop.h
+++ b/effects/fadedesktop/fadedesktop.h
@@ -28,7 +28,7 @@ namespace KWin
 {
 
 class FadeDesktopEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/flipswitch/flipswitch.h b/effects/flipswitch/flipswitch.h
index 701fc30b60..bccb934201 100644
--- a/effects/flipswitch/flipswitch.h
+++ b/effects/flipswitch/flipswitch.h
@@ -31,7 +31,7 @@ namespace KWin
 {
 
 class FlipSwitchEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/invert/invert.h b/effects/invert/invert.h
index b0da551715..8bd84e063d 100644
--- a/effects/invert/invert.h
+++ b/effects/invert/invert.h
@@ -33,7 +33,7 @@ class GLShader;
  * Inverts desktop's colors
  **/
 class InvertEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/lookingglass/lookingglass.cpp b/effects/lookingglass/lookingglass.cpp
index 610e261a36..7004a1f429 100644
--- a/effects/lookingglass/lookingglass.cpp
+++ b/effects/lookingglass/lookingglass.cpp
@@ -43,8 +43,7 @@ KWIN_EFFECT_SUPPORTED(lookingglass, LookingGlassEffect::supported())
 
 
 LookingGlassEffect::LookingGlassEffect()
-    : QObject()
-    , zoom(1.0f)
+    : zoom(1.0f)
     , target_zoom(1.0f)
     , polling(false)
     , m_texture(NULL)
diff --git a/effects/lookingglass/lookingglass.h b/effects/lookingglass/lookingglass.h
index 032a888a60..813b9d28dd 100644
--- a/effects/lookingglass/lookingglass.h
+++ b/effects/lookingglass/lookingglass.h
@@ -37,7 +37,7 @@ class GLVertexBuffer;
 /**
  * Enhanced magnifier
  **/
-class LookingGlassEffect : public QObject, public Effect
+class LookingGlassEffect : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/magnifier/magnifier.h b/effects/magnifier/magnifier.h
index 9001f1f937..185f25414d 100644
--- a/effects/magnifier/magnifier.h
+++ b/effects/magnifier/magnifier.h
@@ -27,7 +27,7 @@ namespace KWin
 {
 
 class MagnifierEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/mousemark/mousemark.h b/effects/mousemark/mousemark.h
index da222a9195..29a8f77a95 100644
--- a/effects/mousemark/mousemark.h
+++ b/effects/mousemark/mousemark.h
@@ -28,7 +28,7 @@ namespace KWin
 {
 
 class MouseMarkEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/presentwindows/presentwindows.h b/effects/presentwindows/presentwindows.h
index 4362bc7e1e..3302654a3d 100644
--- a/effects/presentwindows/presentwindows.h
+++ b/effects/presentwindows/presentwindows.h
@@ -63,7 +63,7 @@ private:
  *  letting the user select active window.
  **/
 class PresentWindowsEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 private:
diff --git a/effects/screenshot/screenshot.h b/effects/screenshot/screenshot.h
index 0b02712504..83b29a8449 100644
--- a/effects/screenshot/screenshot.h
+++ b/effects/screenshot/screenshot.h
@@ -28,7 +28,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 namespace KWin
 {
 
-class ScreenShotEffect : public QObject, public Effect
+class ScreenShotEffect : public Effect
 {
     Q_OBJECT
     Q_CLASSINFO("D-Bus Interface", "org.kde.kwin.Screenshot")
diff --git a/effects/slide/slide.h b/effects/slide/slide.h
index 5befbeecd5..d2d55c087f 100644
--- a/effects/slide/slide.h
+++ b/effects/slide/slide.h
@@ -29,7 +29,7 @@ namespace KWin
 {
 
 class SlideEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/startupfeedback/startupfeedback.h b/effects/startupfeedback/startupfeedback.h
index 0e4ae0785a..057c6b756e 100644
--- a/effects/startupfeedback/startupfeedback.h
+++ b/effects/startupfeedback/startupfeedback.h
@@ -30,7 +30,7 @@ namespace KWin
 class GLTexture;
 
 class StartupFeedbackEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/thumbnailaside/thumbnailaside.h b/effects/thumbnailaside/thumbnailaside.h
index ccb1907be1..02741887ac 100644
--- a/effects/thumbnailaside/thumbnailaside.h
+++ b/effects/thumbnailaside/thumbnailaside.h
@@ -36,8 +36,7 @@ namespace KWin
 {
 
 class ThumbnailAsideEffect
-    : public QObject
-    , public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/trackmouse/trackmouse.h b/effects/trackmouse/trackmouse.h
index 6ef2c889a6..fb26ef59b8 100644
--- a/effects/trackmouse/trackmouse.h
+++ b/effects/trackmouse/trackmouse.h
@@ -31,7 +31,7 @@ namespace KWin
 class GLTexture;
 
 class TrackMouseEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/windowgeometry/windowgeometry.h b/effects/windowgeometry/windowgeometry.h
index 985420208b..993b4aee77 100644
--- a/effects/windowgeometry/windowgeometry.h
+++ b/effects/windowgeometry/windowgeometry.h
@@ -26,7 +26,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 namespace KWin
 {
 
-class WindowGeometry : public QObject, public Effect
+class WindowGeometry : public Effect
 {
     Q_OBJECT
 public:
diff --git a/effects/zoom/zoom.cpp b/effects/zoom/zoom.cpp
index 151797a573..5be354b71c 100644
--- a/effects/zoom/zoom.cpp
+++ b/effects/zoom/zoom.cpp
@@ -57,8 +57,7 @@ static int nominalCursorSize(int iconSize)
 KWIN_EFFECT(zoom, ZoomEffect)
 
 ZoomEffect::ZoomEffect()
-    : QObject()
-    , Effect()
+    : Effect()
     , zoom(1)
     , target_zoom(1)
     , polling(false)
diff --git a/effects/zoom/zoom.h b/effects/zoom/zoom.h
index 74521a5570..fd744acad7 100644
--- a/effects/zoom/zoom.h
+++ b/effects/zoom/zoom.h
@@ -32,7 +32,7 @@ class GLTexture;
 class XRenderPicture;
 
 class ZoomEffect
-    : public QObject, public Effect
+    : public Effect
 {
     Q_OBJECT
 public:
diff --git a/libkwineffects/kwineffects.cpp b/libkwineffects/kwineffects.cpp
index 01d5e5e30a..9c84e17ff9 100644
--- a/libkwineffects/kwineffects.cpp
+++ b/libkwineffects/kwineffects.cpp
@@ -1337,3 +1337,5 @@ void EffectFrame::enableCrossFade(bool enable)
 }
 
 } // namespace
+
+#include "kwineffects.moc"
diff --git a/libkwineffects/kwineffects.h b/libkwineffects/kwineffects.h
index 2343f8f7d7..a894074665 100644
--- a/libkwineffects/kwineffects.h
+++ b/libkwineffects/kwineffects.h
@@ -263,8 +263,9 @@ QRect infiniteRegion()
  *  is called for every window which the screen method is usually called just
  *  once.
  **/
-class KWIN_EXPORT Effect
+class KWIN_EXPORT Effect : public QObject
 {
+    Q_OBJECT
 public:
     /** Flags controlling how painting is done. */
     // TODO: is that ok here?
@@ -579,8 +580,9 @@ public:
  *  desktop or create a special input window to receive mouse and keyboard
  *  events.
  **/
-class KWIN_EXPORT EffectsHandler
+class KWIN_EXPORT EffectsHandler : public QObject
 {
+    Q_OBJECT
     friend class Effect;
 public:
     EffectsHandler(CompositingType type);