diff --git a/tox.ini b/tox.ini
index 6d56c3ec33..e3bf4722db 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,8 +3,8 @@ envlist = {py37,py38,py39,py310}-{sqlite,postgresql}
 
 [testenv]
 commands =
-    coverage run --include=.*/customs/* -m unittest discover -s tests
-    coverage report --include=.*/customs/* --omit=*/tests/*
+    coverage run --include=./**/customs/* -m unittest discover -s tests
+    coverage report --include=./**/customs/* --omit=*/tests/*
 deps =
     coverage
     postgresql: psycopg2 >= 2.7.0