diff --git a/test/spec/ol/tilequeue.test.js b/test/spec/ol/tilequeue.test.js
index 2e1ec1c1cb..5c01615663 100644
--- a/test/spec/ol/tilequeue.test.js
+++ b/test/spec/ol/tilequeue.test.js
@@ -26,8 +26,12 @@ describe('ol.TileQueue', function() {
     ++tileId;
     var tileCoord = [tileId, tileId, tileId];
     var state = 0; // IDLE
-    var src = 'data:image/gif;base64,R0lGODlhAQABAPAAAP8AAP///' +
-        'yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==#' + tileId;
+    // The tile queue requires a unique URI for each item added.
+    // Browsers still load the resource even if they don't understand
+    // the charset.  So we create a unique URI by abusing the charset.
+    var src = 'data:image/gif;charset=junk-' + tileId +
+        ';base64,R0lGODlhAQABAPAAAP8AAP///' +
+        'yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==';
 
     var tileLoadFunction = opt_tileLoadFunction ?
       opt_tileLoadFunction : ol.source.Image.defaultImageLoadFunction;