diff --git a/src/tile.js b/src/tile.js
index b41aa9e9..45f2823b 100644
--- a/src/tile.js
+++ b/src/tile.js
@@ -129,7 +129,7 @@ $.Tile = function(level, x, y, bounds, exists, url, context2D, loadWithAjax, aja
     this.ajaxHeaders = ajaxHeaders;
 
     if (cacheKey === undefined) {
-        $.console.error("Tile constructor needs 'cacheKey' variable: creation tile cache" +
+        $.console.warn("Tile constructor needs 'cacheKey' variable: creation tile cache" +
             " in Tile class is deprecated. TileSource.prototype.getTileHashKey will be used.");
         cacheKey = $.TileSource.prototype.getTileHashKey(level, x, y, url, ajaxHeaders, postData);
     }
diff --git a/src/tilesource.js b/src/tilesource.js
index cba91511..2c99db29 100644
--- a/src/tilesource.js
+++ b/src/tilesource.js
@@ -688,11 +688,14 @@ $.TileSource.prototype = {
      * @param {*} postData data the tile was fetched with (type depends on getTilePostData(..) return type)
      */
     getTileHashKey: function(level, x, y, url, ajaxHeaders, postData) {
-        if (ajaxHeaders) {
-            return url + "+" + JSON.stringify(ajaxHeaders);
-        } else {
-            return url;
+        function withHeaders(hash) {
+            return ajaxHeaders ? hash + "+" + JSON.stringify(ajaxHeaders) : hash;
         }
+
+        if (typeof url !== "string") {
+            return withHeaders(level + "/" + x + "_" + y);
+        }
+        return withHeaders(url);
     },
 
     /**