diff --git a/tox.ini b/tox.ini
index 7369782070..a4d78ea85b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,7 @@ setenv =
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --slowest --testr-args='{posargs}'
+passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:functional]
 sitepackages = True