diff --git a/tox.ini b/tox.ini
index 39b35a8cde..291b5452da 100644
--- a/tox.ini
+++ b/tox.ini
@@ -92,7 +92,7 @@ deps=
       pydocstyle<4.0.0
       # used by flake8-rst-docstrings
       pygments
-commands = flake8 ./lib/ ./test/ ./examples/ setup.py
+commands = flake8 ./lib/ ./test/ ./examples/ setup.py {posargs}
 
 # command run in the github action when cext are active.
 [testenv:github-cext]