diff --git a/httpbin/helpers.py b/httpbin/helpers.py
index fc899e7..a8a7304 100644
--- a/httpbin/helpers.py
+++ b/httpbin/helpers.py
@@ -7,6 +7,7 @@ httpbin.helpers
 This module provides helper functions for httpbin.
 """
 
+import json
 from hashlib import md5
 from werkzeug.http import parse_authorization_header