diff --git a/tox.ini b/tox.ini
index b969bc5da..b205e26e0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py27,docs,pep8
+envlist = py35,py27,docs,pep8
 skipsdist = True
 
 [testenv]