diff --git a/effects/thumbnailaside/thumbnailaside.h b/effects/thumbnailaside/thumbnailaside.h
--- a/effects/thumbnailaside/thumbnailaside.h
+++ b/effects/thumbnailaside/thumbnailaside.h
@@ -65,7 +65,7 @@
 private Q_SLOTS:
     void toggleCurrentThumbnail();
     void slotWindowClosed(KWin::EffectWindow *w);
-    void slotWindowGeometryShapeChanged(KWin::EffectWindow *w, const QRect &old);
+    void slotWindowFrameGeometryChanged(KWin::EffectWindow *w, const QRect &old);
     void slotWindowDamaged(KWin::EffectWindow* w, const QRect& damage);
     bool isActive() const override;
     void repaintAll();
diff --git a/effects/thumbnailaside/thumbnailaside.cpp b/effects/thumbnailaside/thumbnailaside.cpp
--- a/effects/thumbnailaside/thumbnailaside.cpp
+++ b/effects/thumbnailaside/thumbnailaside.cpp
@@ -44,7 +44,7 @@
     connect(a, &QAction::triggered, this, &ThumbnailAsideEffect::toggleCurrentThumbnail);
 
     connect(effects, &EffectsHandler::windowClosed, this, &ThumbnailAsideEffect::slotWindowClosed);
-    connect(effects, &EffectsHandler::windowGeometryShapeChanged, this, &ThumbnailAsideEffect::slotWindowGeometryShapeChanged);
+    connect(effects, &EffectsHandler::windowFrameGeometryChanged, this, &ThumbnailAsideEffect::slotWindowFrameGeometryChanged);
     connect(effects, &EffectsHandler::windowDamaged, this, &ThumbnailAsideEffect::slotWindowDamaged);
     connect(effects, &EffectsHandler::screenLockingChanged, this, &ThumbnailAsideEffect::repaintAll);
     reconfigure(ReconfigureAll);
@@ -92,7 +92,7 @@
     }
 }
 
-void ThumbnailAsideEffect::slotWindowGeometryShapeChanged(EffectWindow* w, const QRect& old)
+void ThumbnailAsideEffect::slotWindowFrameGeometryChanged(EffectWindow* w, const QRect& old)
 {
     foreach (const Data & d, windows) {
         if (d.window == w) {