diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -15,3 +15,11 @@
   flake8
 commands =
   {envpython} -m flake8
+
+[testenv:flake8-phab]
+skip_install = true
+deps =
+  flake8
+  flake8-phabricator-formatter
+commands =
+  {envpython} -m flake8 --format=phabricator --output-file=.phabricator-lint