diff --git a/test/shim/init.js b/test/shim/init.js
index <HASH>..<HASH> 100644
--- a/test/shim/init.js
+++ b/test/shim/init.js
@@ -36,5 +36,5 @@ delete Array.prototype.entries;
 delete Array.prototype.keys;
 delete Array.prototype[Symbol.iterator];
 
-delete this.Map;
-delete this.Promise;
\ No newline at end of file
+delete _es6now.global.Map;
+delete _es6now.global.Promise;
Make tests work without using "this" to get the global object.