diff --git a/tests/Layer/Grid.html b/tests/Layer/Grid.html
index 68c65ecfbe..1a4d9abfca 100644
--- a/tests/Layer/Grid.html
+++ b/tests/Layer/Grid.html
@@ -1181,6 +1181,7 @@
         var map = new OpenLayers.Map('map', {zoomMethod: null});
         var layer = new OpenLayers.Layer.WMS('', '', {}, {
             isBaseLayer: true,
+            transitionEffect: null,
             singleTile: true,
             ratio: 1.1
         });