diff --git a/tox.ini b/tox.ini
index 53d4db71..091016fa 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,6 +24,9 @@ setenv =
     NOSE_COVER_ERASE=1
     NOSE_COVER_MIN_PERCENTAGE=95
 
+[testenv:venv]
+commands = {posargs}
+
 [flake8]
 exclude = .git,.tox,dist,docs,*.egg,build
 show-source = True