diff --git a/lib/recurly/open.js b/lib/recurly/open.js
index 2d60bf5b6..72ca99bf8 100644
--- a/lib/recurly/open.js
+++ b/lib/recurly/open.js
@@ -5,6 +5,7 @@
 
 var bind = require('bind');
 var type = require('type');
+var json = require('json');
 var events = require('event');
 var qs = require('querystring');
 var errors = require('../errors');