diff --git a/tox.ini b/tox.ini
index b92724b3..f202eec9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,4 +14,5 @@ commands = python setup.py testr --slowest --testr-args='{posargs}'
 commands = {posargs}
 
 [testenv:docs]
+basepython=python2.7
 commands = python setup.py build_sphinx