diff --git a/tox.ini b/tox.ini
index cd4118e..3cb4cf4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ install_command = pip install {opts} {packages}
 envlist = {py36,py38,py39}-{1.11,2.2,3.2,4.2}, flake8
 
 [testenv]
-passenv = LANG POSTGRES_HOST POSTGRES_DB POSTGRES_PASSWORD POSTGRES_PORT POSTGRES_USER
+passenv = LANG,POSTGRES_HOST,POSTGRES_DB,POSTGRES_PASSWORD,POSTGRES_PORT,POSTGRES_USER
 usedevelop = True
 setenv =
   TOXENV={envname}