diff --git a/tox.ini b/tox.ini
index 7aabddd0..4304aba2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ deps =
      -r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 commands = ostestr {posargs}
-passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
+passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY OS_*
 
 [testenv:pep8]
 whitelist_externals = bash