diff --git a/src/ol/source/urltilesource.js b/src/ol/source/urltilesource.js
index 14216d0ee2..f1b618c195 100644
--- a/src/ol/source/urltilesource.js
+++ b/src/ol/source/urltilesource.js
@@ -183,8 +183,7 @@ ol.source.UrlTile.prototype.setTileUrlFunction = function(tileUrlFunction) {
  * @api stable
  */
 ol.source.UrlTile.prototype.setUrl = function(url) {
-  this.urls = [url];
-  var urls = ol.TileUrlFunction.expandUrl(url);
+  var urls = this.urls = ol.TileUrlFunction.expandUrl(url);
   this.setTileUrlFunction(this.fixedTileUrlFunction ?
       this.fixedTileUrlFunction.bind(this) :
       ol.TileUrlFunction.createFromTemplates(urls, this.tileGrid));