diff --git a/tox.ini b/tox.ini
index 215c5db..a01e19e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,6 +20,7 @@ commands =
 commands = {posargs}
 
 [testenv:docs]
+basepython = python2.7
 commands =
     find . -type f -name "*.pyc" -delete
     python setup.py build_sphinx