diff --git a/oslo_messaging/tests/__init__.py b/oslo_messaging/tests/__init__.py
index ed8a3f831..a75944b6d 100644
--- a/oslo_messaging/tests/__init__.py
+++ b/oslo_messaging/tests/__init__.py
@@ -15,9 +15,3 @@
 
 import eventlet
 eventlet.monkey_patch()
-
-# oslotest prepares mock for six in oslotest/__init__.py as follow:
-# six.add_move(six.MovedModule('mock', 'mock', 'unittest.mock')) and
-# oslo.messaging imports oslotest before importing test submodules to
-# setup six.moves for mock, then "from unittest import mock" works well.
-import oslotest