diff --git a/src/effects.cpp b/src/effects.cpp
index 880ef5e20b..086cf7d7eb 100644
--- a/src/effects.cpp
+++ b/src/effects.cpp
@@ -1987,7 +1987,7 @@ void EffectWindowImpl::setSceneWindow(Scene::Window* w)
 
 QRect EffectWindowImpl::decorationInnerRect() const
 {
-    return toplevel->transparentRect();
+    return toplevel->rect() - toplevel->frameMargins();
 }
 
 QByteArray EffectWindowImpl::readProperty(long atom, long type, int format) const
diff --git a/src/scene.cpp b/src/scene.cpp
index 079790ad4a..60f8eb3cc3 100644
--- a/src/scene.cpp
+++ b/src/scene.cpp
@@ -656,7 +656,8 @@ void Scene::Window::unreferencePreviousPixmap_helper(SurfaceItem *item)
 
 QRegion Scene::Window::decorationShape() const
 {
-    return QRegion(toplevel->rect()) - toplevel->transparentRect();
+    const QRect decorationInnerRect = toplevel->rect() - toplevel->frameMargins();
+    return QRegion(toplevel->rect()) - decorationInnerRect;
 }
 
 bool Scene::Window::isVisible() const
diff --git a/src/toplevel.h b/src/toplevel.h
index 2890181b50..1d15746da6 100644
--- a/src/toplevel.h
+++ b/src/toplevel.h
@@ -362,7 +362,6 @@ public:
      * Returns a rectangle that the window occupies on the screen, including drop-shadows.
      */
     QRect visibleGeometry() const;
-    QRect transparentRect() const;
     virtual bool isClient() const;
     virtual bool isDeleted() const;
 
@@ -789,11 +788,6 @@ inline QRect Toplevel::rect() const
     return QRect(0, 0, width(), height());
 }
 
-inline QRect Toplevel::transparentRect() const
-{
-    return isShade() ? QRect() : QRect(clientPos(), clientSize());
-}
-
 inline bool Toplevel::readyForPainting() const
 {
     return ready_for_painting;