diff --git a/tox.ini b/tox.ini
index c35837b..54ba240 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,6 +19,9 @@ whitelist_externals = bash
 deps = -r{toxinidir}/pep8-test-requirements.txt
 commands = flake8
 
+[testenv:venv]
+commands = {posargs}
+
 [flake8]
 ignore =
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build