diff --git a/tox.ini b/tox.ini
index f009ff1..ed0aa46 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ minversion = 1.6
 skipsdist = True
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:func]