diff --git a/tox.ini b/tox.ini
index db0106c9..ce96fd4f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,9 @@ setenv = VIRTUAL_ENV={envdir}
          LC_ALL=en_US.utf-8
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
+[testenv:venv]
+commands = {posargs}
+
 [testenv:py35]
 basepython = python3.5
 commands =