diff --git a/tox.ini b/tox.ini
index 8a6bdac13c..b4657af698 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ envlist =
    py3{6,7,8,9}-functional
 
 [testenv]
-passenv = TOXENV CI TRAVIS TRAVIS_*
+passenv = TOXENV,CI,TRAVIS,TRAVIS_*
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 deps = -r{toxinidir}/test-requirements.txt