diff --git a/src/ol/tile/tilegrid.js b/src/ol/tile/tilegrid.js
index e8d4c1c5ce..ebeca5088f 100644
--- a/src/ol/tile/tilegrid.js
+++ b/src/ol/tile/tilegrid.js
@@ -28,7 +28,7 @@ ol.TileGrid = function(resolutions, extent, origin, opt_tileSize) {
    */
   this.resolutions_ = resolutions;
   goog.asserts.assert(goog.array.isSorted(resolutions, function(a, b) {
-    return -goog.array.defaultCompare(a, b);
+    return b - a;
   }, true));
 
   /**