diff --git a/scene_xrender.cpp b/scene_xrender.cpp
index 03c0d156e4..98295f0544 100644
--- a/scene_xrender.cpp
+++ b/scene_xrender.cpp
@@ -315,7 +315,6 @@ SceneXrender::Window::Window(Toplevel* c, SceneXrender *scene)
     : Scene::Window(c)
     , m_scene(scene)
     , format(XRenderUtils::findPictFormat(c->visual()))
-    , alpha_cached_opacity(0.0)
 {
 }
 
diff --git a/scene_xrender.h b/scene_xrender.h
index af8d2c2b18..a9eee6bf1c 100644
--- a/scene_xrender.h
+++ b/scene_xrender.h
@@ -206,7 +206,6 @@ private:
     void setPictureFilter(xcb_render_picture_t pic, ImageFilterType filter);
     SceneXrender *m_scene;
     xcb_render_pictformat_t format;
-    double alpha_cached_opacity;
     QRegion transformed_shape;
     static QRect temp_visibleRect;
     static XRenderPicture *s_tempPicture;