diff --git a/test/test-extensions.js b/test/test-extensions.js
index a1448d3272..a3d45294fb 100644
--- a/test/test-extensions.js
+++ b/test/test-extensions.js
@@ -514,4 +514,4 @@ goog.require('ol.renderer.webgl.Map');
     }
   });
 
-})(this);
+})(window);