diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index d37fc20ff5..d6c0c95a24 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -10,14 +10,12 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
     params: null,
 
     // tileSize: OpenLayers.Size
-    tileSize: null,
+    tileSize: new OpenLayers.Size(256,256),
 
     // grid: Array(Array())
     // this is an array of rows, each row is an array of tiles
     grid: null,
 
-    tileSize: new OpenLayers.Size(256,256),
-
     /**
     * @param {str} name
     * @param {str} url