diff --git a/test_httpbin.py b/test_httpbin.py
index b7104ffc..298792df 100755
--- a/test_httpbin.py
+++ b/test_httpbin.py
@@ -6,7 +6,7 @@
 import contextlib
 import six
 import json
-from werkzeug.http import parse_dict_header
+from werkzeug.http import _dt_as_utc
 from hashlib import md5, sha256, sha512
 from six import BytesIO