diff --git a/tox.ini b/tox.ini
index 2dc920371..5fee6dbb9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@
 [tox]
 envlist =
     lint
-    py{27,35,36,37}
+    py{27,35,36,37,py3}
 minversion = 1.9
 
 [testenv]