diff --git a/lib/express-expose.js b/lib/express-expose.js
index 4c9112b..1b1000e 100644
--- a/lib/express-expose.js
+++ b/lib/express-expose.js
@@ -215,7 +215,7 @@ function renderNamespace(str){
   return str.split('.').map(function(part, i){
     parts.push(part);
     part = parts.join('.');
-    return (i ? '' : 'var ') + part + ' = ' + part + ' || {};';
+    return (i ? '' : 'window.') + part + ' = window.' + part + ' || {};';
   }).join('\n');
 }