diff --git a/tox.ini b/tox.ini
index 54a05caba..b57119403 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ deps = -r{toxinidir}/requirements.txt
 commands = python setup.py testr --testr-args='{posargs}'
 
 [testenv:pep8]
-commands = flake8
+commands = flake8 {posargs}
 
 [testenv:venv]
 commands = {posargs}