diff --git a/src/saml2/validate.py b/src/saml2/validate.py
index 43672d6..094c6c9 100644
--- a/src/saml2/validate.py
+++ b/src/saml2/validate.py
@@ -1,7 +1,7 @@
 import calendar
 from six.moves.urllib.parse import urlparse
 import re
-import time_util
+from saml2 import time_util
 import struct
 import base64