diff --git a/tests/Layer/test_Grid.html b/tests/Layer/test_Grid.html
index 8928b045e3..c0507f667d 100644
--- a/tests/Layer/test_Grid.html
+++ b/tests/Layer/test_Grid.html
@@ -91,7 +91,7 @@
 
 
     function test_04_Layer_Grid_getTilesBounds(t) {
-        t.plan( 3 );
+        t.plan( 4 );
 
         layer = new OpenLayers.Layer.WMS(name, url, params);