diff --git a/lib/OpenLayers/Layer/TileCache.js b/lib/OpenLayers/Layer/TileCache.js
index 745e319a81..a15725b055 100644
--- a/lib/OpenLayers/Layer/TileCache.js
+++ b/lib/OpenLayers/Layer/TileCache.js
@@ -133,7 +133,7 @@ OpenLayers.Layer.TileCache = OpenLayers.Class(OpenLayers.Layer.Grid, {
         if (url instanceof Array) {
             url = this.selectUrl(path, url);
         }
-        url = (url[url.length - 1] == '/') ? url : url + '/';
+        url = (url.charAt(url.length - 1) == '/') ? url : url + '/';
         return url + path;
     },