diff --git a/tox.ini b/tox.ini
index c42394b21..5280da0e9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,8 +10,8 @@ setenv =
   VIRTUAL_ENV={envdir}
   LANGUAGE=en_US
   LC_ALL=en_US.utf-8
-passenv=
-  GITHUB_REF_NAME,
+passenv =
+  GITHUB_REF_NAME
   GITHUB_BASE_REF
 deps =
     -r{toxinidir}/requirements.txt