diff --git a/tox.ini b/tox.ini
index c6cee92568..ca8373662b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = packaging, py27, py36 pep8
+envlist = packaging, py27, py36, pep8
 
 [testenv]
 deps =