diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 724055e52e..a70e347733 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -353,7 +353,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
         var minCols = Math.ceil(viewSize.w/this.tileSize.w) +
                       Math.max(1, 2 * this.buffer);
         
-        var extent = this.map.getMaxExtent();
+        var extent = this.maxExtent;
         var resolution = this.map.getResolution();
         
         var tileLayout = this.calculateGridLayout(bounds, extent, resolution);
@@ -719,7 +719,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * {<OpenLayers.Bounds>} Bounds of the tile at the given pixel location.
      */
     getTileBounds: function(viewPortPx) {
-        var maxExtent = this.map.getMaxExtent();
+        var maxExtent = this.maxExtent;
         var resolution = this.getResolution();
         var tileMapWidth = resolution * this.tileSize.w;
         var tileMapHeight = resolution * this.tileSize.h;