diff --git a/lib/mocha/mocha.ts b/lib/mocha/mocha.ts
index 7e79f8538..f04fe5a8b 100644
--- a/lib/mocha/mocha.ts
+++ b/lib/mocha/mocha.ts
@@ -170,4 +170,4 @@
 
   })(Mocha.Runner.prototype.runTest, Mocha.Runner.prototype.run);
 
-})(window);
\ No newline at end of file
+})(typeof window !== 'undefined' && window || typeof self !== 'undefined' && self || global);