diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 570510e973..b890c632e9 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -306,15 +306,15 @@ OpenLayers.Layer.Grid.prototype =
         var center = this.map.getCenter();
         if (center != null) {
 
- 	            var res = this.getResolution();
- 	            var size = this.map.getSize();
- 	            var w_deg = size.w * res;
- 	            var h_deg = size.h * res;
+            var res = this.getResolution();
+            var size = this.map.getSize();
+            var w_deg = size.w * res;
+            var h_deg = size.h * res;
 
- 	            return new OpenLayers.Bounds(center.lon - w_deg / 2,
-                         	                 center.lat - h_deg / 2,
-                         	                 center.lon + w_deg / 2,
-                          	                 center.lat + h_deg / 2);
+            extent = new OpenLayers.Bounds(center.lon - w_deg / 2,
+                                           center.lat - h_deg / 2,
+                                           center.lon + w_deg / 2,
+                                           center.lat + h_deg / 2);
 
         }