diff --git a/tox.ini b/tox.ini
index db2ac53510..f6cc894081 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,6 +21,7 @@ setenv = VIRTUAL_ENV={envdir}
          NAILGUN_DB_ROOT=postgres
          NAILGUN_DB_ROOTPW=insecure_slave
          NAILGUN_DB_ROOTPGPASS={toxinidir}/nailgun/pgpass
+passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 deps = -r{toxinidir}/nailgun/test-requirements.txt
 commands =
     bash "{toxinidir}/nailgun/tools/prepare_settings_yaml.sh"