diff --git a/lib/oauth2.js b/lib/oauth2.js
index 373f135..ed6c680 100644
--- a/lib/oauth2.js
+++ b/lib/oauth2.js
@@ -72,7 +72,7 @@ exports.OAuth2.prototype._request= function(method, url, headers, post_body, acc
     }
   }
 
-  request = https.request(options, function (response) {
+  var request = https.request(options, function (response) {
     response.on("data", function (chunk) {
       result+= chunk
     });