diff --git a/setup.py b/setup.py
index 1116b1794..9b23c602d 100644
--- a/setup.py
+++ b/setup.py
@@ -15,6 +15,7 @@ install_requires = [
     "pyaml",
     "pytz",
     "python-dateutil",
+    "mock",
 ]
 
 extras_require = {