diff --git a/tox.ini b/tox.ini
index 25c56bb..8888793 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,6 +30,7 @@ commands =
   coverage report
 
 [testenv:docs]
+basepython=python3
 commands =
   python setup.py build_sphinx
   oslo-config-generator --config-file=etc/nova/nova-dpm-config-generator.conf