diff --git a/tox.ini b/tox.ini
index 5520dd83d0..59dd39670d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,6 +12,9 @@ deps = -r{toxinidir}/requirements.txt
 commands =
     flake8
 
+[testenv:venv]
+commands = {posargs}
+
 [testenv:docs]
 commands = python setup.py build_sphinx