diff --git a/flask/json.py b/flask/json.py
index d5da4f91..6b95fde0 100644
--- a/flask/json.py
+++ b/flask/json.py
@@ -16,7 +16,7 @@ from werkzeug.http import http_date
 
 # Use the same json implementation as itsdangerous on which we
 # depend anyways.
-from itsdangerous import simplejson as _json
+from itsdangerous import json as _json
 import six