diff --git a/tox.ini b/tox.ini
index 41efb9c328..a0eed9c1fe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ skipsdist = True
 basepython=python2.7
 setenv =
    VIRTUAL_ENV={envdir}
+passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 deps = -r{toxinidir}/test-requirements.txt
 whitelist_externals =
   bash