diff --git a/requirements/test.txt b/requirements/test.txt
index 2354363..018d1f2 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -4,4 +4,4 @@ flake8
 nose
 six>=1.4.0
 PyYAML
-mock
+mock; python_version < '3.3'
diff --git a/test/test_functional.py b/test/test_functional.py
index 5049928..9275ffc 100644
--- a/test/test_functional.py
+++ b/test/test_functional.py
@@ -2,7 +2,10 @@
 import json
 
 import six
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 from ddt import ddt, data, file_data
 from nose.tools import (
diff --git a/tox.ini b/tox.ini
index da77f04..10b5e0a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,6 @@ deps =
     flake8
     six>=1.4.0
     PyYAML
-    mock
 commands = 
     nosetests -s --with-coverage --cover-package=ddt --cover-html
     flake8 ddt.py test
@@ -16,6 +15,7 @@ commands =
 [testenv:py27]
 deps =
     {[testenv]deps}
+    mock
     Sphinx
     sphinxcontrib-programoutput
 commands =