diff --git a/effects/presentwindows/presentwindows.cpp b/effects/presentwindows/presentwindows.cpp
index a42427456a..b7c2b9502e 100644
--- a/effects/presentwindows/presentwindows.cpp
+++ b/effects/presentwindows/presentwindows.cpp
@@ -405,6 +405,7 @@ void PresentWindowsEffect::windowAdded( EffectWindow *w )
         m_windowData[w].visible = true;
         m_windowData[w].highlight = 1.0;
         m_closeWindow = w;
+        w->setData( WindowForceBlurRole, QVariant( true ) );
         }
     }