diff --git a/tox.ini b/tox.ini
index 842707ad..237b60c9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,6 +12,7 @@ downloadcache = ~/cache/pip
 [testenv:py27]
 
 [testenv:pep8]
+deps = pep8
 commands = pep8 --repeat --show-source --exclude=.venv,.tox,dist,doc,*openstack/common*,*lib/python*,*egg libra setup.py
 
 [testenv:pyflakes]