diff --git a/test-requirements.txt b/test-requirements.txt
index 734158db..ef53c007 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -12,6 +12,7 @@ python-subunit>=0.0.18
 oslotest>=1.2.0  # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4
+mock>=2.0 # BSD
 testtools>=0.9.36,!=1.2.0
 python-swiftclient>=3.1.0
 python-keystoneclient