diff --git a/tox.ini b/tox.ini
index 2d7734c61..7265ba537 100644
--- a/tox.ini
+++ b/tox.ini
@@ -80,7 +80,7 @@ commands = {toxinidir}/run-upgrade-tests.sh mysql-ceph
 [testenv:pep8]
 basepython = python3
 deps = hacking>=0.12
-commands = flake8
+commands = flake8 {posargs}
 allowlist_externals =
     /usr/bin/flake8