diff --git a/effects/presentwindows/presentwindows.cpp b/effects/presentwindows/presentwindows.cpp
index 6c283385b1..61e0002b78 100644
--- a/effects/presentwindows/presentwindows.cpp
+++ b/effects/presentwindows/presentwindows.cpp
@@ -679,6 +679,8 @@ void PresentWindowsEffect::tabBoxAdded( int mode )
         setActive( true );
         if( m_activated )
             effects->refTabBox();
+        else
+            m_tabBoxEnabled = false;
         }
     }