diff --git a/tox.ini b/tox.ini
index 2684e857..74cf8e25 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,6 +49,7 @@ per-file-ignores =
 [testenv:check]
 deps =
     flake8
+    flake8-commas
 skip_install = true
 commands =
     flake8 core tests setup.py