diff --git a/setup.py b/setup.py
index 77fba29f8e5c31368f1ce333962e33e91cd4da7a..f6a066194eb3f3f797009802a38cd6a2fde5de6c 100644
--- a/setup.py
+++ b/setup.py
@@ -102,7 +102,7 @@ setup(
     install_requires=install_requires,
 
     setup_requires=['pytest-runner'],
-    tests_require=['pytest', 'pytest-cov', 'pytest-runner'],
+    tests_require=['pytest', 'mock', 'pytest-cov', 'pytest-runner'],
     test_suite='tests',
 
     cmdclass={'doc' : doc},