Index: tox.ini
===================================================================
--- tox.ini
+++ tox.ini
@@ -11,6 +11,7 @@
 
 [tox]
 envlist = py27
+          py3
           mypy
           flake8
 
@@ -31,6 +32,7 @@
 commands =
     # No where close to passing yet, but nice to have.
     - mypy --junit-xml=junit-{envname}.xml --py2 --ignore-missing-imports lnt
+    - mypy --junit-xml=junit-{envname}.xml --ignore-missing-imports lnt
 
 [testenv:flake8]
 skip_install = true