diff --git a/tox.ini b/tox.ini
index 4b2a9ae4c..3680e13f0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,6 +34,8 @@ deps =
 
 
 [testenv:neutron]
+basepython = python3
+
 commands =
     stestr --test-path ./tobiko/tests/scenario run {posargs}