diff --git a/test/view.map.test.js b/test/view.map.test.js
index 5b9e85d8..aa7f78f9 100644
--- a/test/view.map.test.js
+++ b/test/view.map.test.js
@@ -265,8 +265,7 @@ test('Custom map options', function () {
 
   assertPresent(tiles);
 
-  ok(tiles.find('.leaflet-tile')[0].src.startsWith('http://example.com'));
-
+  ok(tiles.find('.leaflet-tile')[0].src.indexOf('http://example.com') === 0);
   ok(view.$el.find('.leaflet-control-attribution').text().indexOf('MyTiles') !== -1);
 
   view.remove();