diff --git a/tests/hazmat/primitives/test_pbkdf2hmac.py b/tests/hazmat/primitives/test_pbkdf2hmac.py
index 62ca092..e928fc6 100644
--- a/tests/hazmat/primitives/test_pbkdf2hmac.py
+++ b/tests/hazmat/primitives/test_pbkdf2hmac.py
@@ -14,6 +14,7 @@
 from __future__ import absolute_import, division, print_function
 
 import pytest
+
 import six
 
 from cryptography import utils