diff --git a/dev-requirements.txt b/dev-requirements.txt
index 3397408..1908775 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,4 +1,5 @@
 pep8
 pyflakes
 mccabe
+mock
 nose
diff --git a/setup.py b/setup.py
index 12dc391..d98428b 100644
--- a/setup.py
+++ b/setup.py
@@ -52,6 +52,6 @@ setup(
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Topic :: Software Development :: Quality Assurance",
     ],
-    tests_require=['nose'],
+    tests_require=['nose', 'mock'],
     test_suite='nose.collector',
 )