diff --git a/packages/loader/lib/main.js b/packages/loader/lib/main.js
index e28da9d1ac6..b63969b7241 100644
--- a/packages/loader/lib/main.js
+++ b/packages/loader/lib/main.js
@@ -2,7 +2,8 @@ var define, requireModule, require, requirejs, Ember;
 var mainContext = this;
 
 (function() {
-  var isNode = typeof process !== 'undefined' && {}.toString.call(process) === '[object process]';
+  var isNode = typeof window === 'undefined' &&
+    typeof process !== 'undefined' && {}.toString.call(process) === '[object process]';
 
   if (!isNode) {
     Ember = this.Ember = this.Ember || {};