diff --git a/effects/desktopgrid/desktopgrid.cpp b/effects/desktopgrid/desktopgrid.cpp
index 8d94852de6..711ab4cab2 100644
--- a/effects/desktopgrid/desktopgrid.cpp
+++ b/effects/desktopgrid/desktopgrid.cpp
@@ -809,7 +809,7 @@ EffectWindow* DesktopGridEffect::windowAt( QPoint pos ) const
 
     int desktop;
     pos = unscalePos( pos, &desktop );
-    if( desktop >= effects->numberOfDesktops() )
+    if( desktop > effects->numberOfDesktops() )
         return NULL;
     if( isUsingPresentWindows() )
         {