diff --git a/tox.ini b/tox.ini
index 49c78959d..c38df434b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ deps =
   py39-black-{run,check}: black
   py39-mypy: mypy >= 0.900
 commands =
-        py39-lint: flake8 src doc maintenance tests --ignore E402,E501,E203,W503,E741 --exclude src/vendor
+        py39-lint: flake8 src doc maintenance tests --ignore E402,E501,E203,W503,E741 --exclude src/tests,src/vendor
         py39-invalidcode: flake8 src bin maintenance --exclude src/tests,src/vendor --select F,E722,W605
         py39-black-check: black --check --diff bin src doc maintenance tests
         py39-black-run: black bin src doc maintenance tests