diff --git a/tox.ini b/tox.ini
index 6f3c09fddb..3b74bb5a13 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ basepython = python3
 [testenv]
 usedevelop = true
 # OBJC_DISABLE_INITIALIZE_FORK_SAFETY fixes hung tests for MacOS users. (#30806)
-passenv = DJANGO_SETTINGS_MODULE PYTHONPATH HOME DISPLAY OBJC_DISABLE_INITIALIZE_FORK_SAFETY
+passenv = DJANGO_SETTINGS_MODULE,PYTHONPATH,HOME,DISPLAY,OBJC_DISABLE_INITIALIZE_FORK_SAFETY
 setenv =
     PYTHONDONTWRITEBYTECODE=1
 deps =