diff --git a/tox.ini b/tox.ini
index c5157f42..9de75415 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,12 @@ envlist = py27,pep8
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
+passenv =  http_proxy
+           HTTP_PROXY
+           https_proxy
+           HTTPS_PROXY
+           no_proxy
+           NO_PROXY
 usedevelop = True
 install_command =
     {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}