diff --git a/kcmkwin/kwincompositing/advanced.cpp b/kcmkwin/kwincompositing/advanced.cpp
index 031c7ad8f6..aa2dbdb533 100644
--- a/kcmkwin/kwincompositing/advanced.cpp
+++ b/kcmkwin/kwincompositing/advanced.cpp
@@ -53,6 +53,8 @@ KWinAdvancedCompositingOptions::KWinAdvancedCompositingOptions(QWidget* parent,
     connect(ui.glDirect, SIGNAL(toggled(bool)), this, SLOT(changed()));
     connect(ui.glVSync, SIGNAL(toggled(bool)), this, SLOT(changed()));
 
+    connect(ui.xrenderSmoothScale, SIGNAL(toggled(bool)), this, SLOT(changed()));
+
     connect(this, SIGNAL(okClicked()), this, SLOT(save()));
     connect(this, SIGNAL(applyClicked()), this, SLOT(save()));