diff --git a/tox.ini b/tox.ini
index d7a99187..da41e94e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,7 @@ setenv =
 commands = bash tools/pretty_tox.sh "{posargs}"
 
 [testenv:functional]
+passenv = OS_*
 setenv =
     VIRTUAL_ENV={envdir}
     DISCOVER_DIRECTORY=saharaclient/tests/functional/