diff --git a/tox.ini b/tox.ini
index 8da9de490..7c2e08ba8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -58,7 +58,7 @@ whitelist_externals =
 
 [testenv:pep8]
 
-commands = flake8
+commands = flake8 --max-complexity 10
 deps =
     {[testenv]deps}
     -r{toxinidir}/pep8-requirements.txt