diff --git a/setup.py b/setup.py
index 4e93a6d5..1e52ba8d 100644
--- a/setup.py
+++ b/setup.py
@@ -31,6 +31,7 @@ tests_require = [
     # https://bitbucket.org/pypa/setuptools/issue/196/
     'pytest-httpbin',
     'pytest',
+    'mock',
 ]