diff --git a/effects.cpp b/effects.cpp
index 7025883505..eaab46ff32 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -440,6 +440,7 @@ void EffectsHandlerImpl::slotDeletedRemoved(KWin::Deleted *d)
 
 void EffectsHandlerImpl::slotWindowClosed(KWin::Toplevel *c)
 {
+    c->disconnect(this);
     emit windowClosed(c->effectWindow());
 }