diff --git a/lib/expose.js b/lib/expose.js
index b2e0c4b..498dfe2 100644
--- a/lib/expose.js
+++ b/lib/expose.js
@@ -63,8 +63,8 @@ function renderNamespace(str){
  
   return str.split('.').map(function(part, i){
     parts.push(part);
-    part = parts.join('.');
-    return (i ? '' : 'window.') + part + ' = ' + part + ' || {};';
+    part = (i ? '' : 'window.') + parts.join('.');
+    return part + ' || (' + part + ' = {});';
   }).join('\n');
 }