diff --git a/tox.ini b/tox.ini
index 4b059ff..607b182 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,10 @@
 [tox]
-envlist = {py27,py35,py36,py37,py38}-{c,pure},{pypy,pypy3}-pure,py27-x86,py34-x86
+envlist =
+    py27-pure,
+    {py35,py36,py37,py38}-{c,pure},
+    {pypy,pypy3}-pure,
+    py27-x86,
+    py34-x86,
 
 [variants:pure]
 setenv=