diff --git a/tox.ini b/tox.ini
index c6cee92568371594710bc672ff6a13c3f50d7f1a..ca8373662bd839c17fc6f136e8483d60c68c7731 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = packaging, py27, py36 pep8
+envlist = packaging, py27, py36, pep8
 
 [testenv]
 deps =