diff --git a/lib/api/index.js b/lib/api/index.js
index 21bb552..b44f52b 100644
--- a/lib/api/index.js
+++ b/lib/api/index.js
@@ -15,7 +15,7 @@ var api = {
 };
 
 module.exports = function(obj){
-    for(key in api){
+    for(var key in api){
         obj[key] = api[key];
     }
 };