diff --git a/tox.ini b/tox.ini
index 657eaf0dde..e31a70dcd7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1.1
-envlist = py{27,36,37},functional,pep8
+envlist = py27,py37,functional,pep8
 # Automatic envs (pyXX) will only use the python version appropriate to that
 # env and ignore basepython inherited from [testenv] if we set
 # ignore_basepython_conflict.