diff --git a/tox.ini b/tox.ini
index 6e6fa2b63..49502aad0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,6 +34,7 @@ commands =
   python setup.py testr --coverage
 
 [testenv:docs]
+basepython = python3
 commands =
   python setup.py build_sphinx