diff --git a/tox.ini b/tox.ini
index b829079..edf635e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,9 @@ commands =
   find . -type f -name "*.pyc" -delete
   rm -Rf .testrepository/times.dbm
 
+[testenv:venv]
+commands = {posargs}
+
 [testenv:docs]
 commands =
     rm -rf doc/build