diff --git a/tox.ini b/tox.ini
index 7ba9ee2..1c62032 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,7 +26,9 @@ allowlist_externals =
   bash
   isort
   echo
-passenv = *_proxy *_PROXY
+passenv =
+  *_proxy
+  *_PROXY
 
 [testenv:venv]
 deps =