diff --git a/kcmkwin/kwincompositing/main.cpp b/kcmkwin/kwincompositing/main.cpp
index d3c40c65ea..5aed7d08d9 100644
--- a/kcmkwin/kwincompositing/main.cpp
+++ b/kcmkwin/kwincompositing/main.cpp
@@ -82,6 +82,7 @@ KWinCompositingKCM::KWinCompositingKCM(QWidget* parent, const QVariantList& args
     connect(m_view.data(), &KWin::Compositing::EffectView::changed, [this]{
         emit changed(true);
     });
+    w->setFocusPolicy(Qt::StrongFocus);
 }
 
 KWinCompositingKCM::~KWinCompositingKCM()