diff --git a/tox.ini b/tox.ini
index 7173d5f..17922a7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,7 @@
 [tox]
-envlist = py27,py36,pypy,codechecks,black
+envlist = py27,py36,py37,pypy,codechecks,black
+
+skip_missing_interpreters = true
 
 # Autoformatter
 [testenv:black]
@@ -8,7 +10,7 @@ skip_install = true
 deps =
     black
 commands =
-    black -l 99 .
+    black -l 99 {posargs:setup.py miqsel}
 
 # Lintchecker
 [testenv:codechecks]