diff --git a/tox.ini b/tox.ini
index 645a1a5..a921ff2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,9 @@ deps =
 skip_install = True
 basepython = python3.6
 deps = -rrequirements-stylecheck.txt
-commands = flake8 {posargs}
+commands =
+    black --check
+    flake8 {posargs}
 
 [gh-actions]
 python =