diff --git a/lib/OpenLayers/Layer/MapGuide.js b/lib/OpenLayers/Layer/MapGuide.js
index 68994193cb..3588c98bf1 100644
--- a/lib/OpenLayers/Layer/MapGuide.js
+++ b/lib/OpenLayers/Layer/MapGuide.js
@@ -264,7 +264,7 @@ OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, {
     getURL: function (bounds) {
         var url;
         var center = bounds.getCenterLonLat();
-        var mapSize = this.map.getCurrentSize();
+        var mapSize = this.map.getSize();
 
         if (this.singleTile) {
           //set up the call for GETMAPIMAGE or GETDYNAMICMAPOVERLAY with