diff --git a/tox.ini b/tox.ini
index c478a7b6..768ac6e5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,6 +19,11 @@ commands =
     find . -type f -name "*.pyc" -delete
     rm -Rf .testrepository/times.dbm
 
+[testenv:venv]
+basepython=python3
+commands =
+  {posargs}
+
 [testenv:py35]
 basepython = python3.5
 commands =