diff --git a/py_asciimath/transformer/const.py b/py_asciimath/transformer/const.py
index 98f4212..39d4bf5 100644
--- a/py_asciimath/transformer/const.py
+++ b/py_asciimath/transformer/const.py
@@ -1,7 +1,10 @@
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
+from __future__ import (
+    absolute_import,
+    division,
+    print_function,
+    unicode_literals,
+)
 
-from builtins import dict
 from itertools import islice
 
 # # from future import standard_library
diff --git a/tox.ini b/tox.ini
index d9e3950..78836c2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,py36,py37,38
+envlist = py27,py34,py35,py36,py37,py38
 
 [testenv]
 deps =