diff --git a/tox.ini b/tox.ini
index 32c357d..831f72c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ basepython =
     py310: python3.10
     py311: python3.11
 
-passenv = CI GITHUB_WORKFLOW
+passenv = CI,GITHUB_WORKFLOW
 
 commands =
     pip install pip --upgrade