diff --git a/lib/http_client.js b/lib/http_client.js
index 1578fc7..bfcb8fc 100644
--- a/lib/http_client.js
+++ b/lib/http_client.js
@@ -115,7 +115,7 @@ client.prototype.request = function(method, path, params, callback){
         });
 
         res.on('end', function(){
-            error = null;
+            var error = null;
             try{ data = JSON.parse(data); }catch(e){}
             if(data['errors']){
                 error = data['errors'];