diff --git a/tox.ini b/tox.ini
index 06d7907..6a1b29f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,4 +4,5 @@ skipsdist = True
 envlist = py27,py34
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}