diff --git a/tox.ini b/tox.ini
index eb4146f..3cc838e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,6 +12,7 @@ setenv =
 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
 
 [testenv:pep8]
 commands = flake8