diff --git a/lib/OpenLayers/Layer/KaMap.js b/lib/OpenLayers/Layer/KaMap.js
index 36aa7a154c..212621f86b 100644
--- a/lib/OpenLayers/Layer/KaMap.js
+++ b/lib/OpenLayers/Layer/KaMap.js
@@ -48,7 +48,7 @@ OpenLayers.Layer.KaMap.prototype =
      * @type String
      */
     getURL: function (bounds) {
-        var zoom = this.map.getZoom();
+        var mapRes = this.map.getResolution();
         var scale = this.map.getScale();        
         var cellSize = new OpenLayers.Size(mapRes*this.tileSize.w, mapRes*this.tileSize.h);
         var pX = Math.round(((bounds.left) / cellSize.w) * this.tileSize.w);