diff --git a/tox.ini b/tox.ini
index ed24ba5..929ee38 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,7 @@ platform =
     macos: darwin
     linux: linux
     windows: win32
-passenv = CI GITHUB_ACTIONS DISPLAY XAUTHORITY
+passenv = CI,GITHUB_ACTIONS,DISPLAY,XAUTHORITY
 setenv =
     PYTHONPATH = {toxinidir}
 extras =