diff --git a/tox.ini b/tox.ini
index 83a9a01..25dbb6a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,9 @@ ignore_basepython_conflict = True
 [testenv]
 usedevelop = True
 install_command = pip install {opts} {packages}
-passenv = OS_* OPENSTACKSDK_*
+passenv =
+    OS_*
+    OPENSTACKSDK_*
 setenv =
     VIRTUAL_ENV={envdir}
     LANG=en_US.UTF-8