diff --git a/tox.ini b/tox.ini
index 6c7f19f7d..c0122ef20 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,6 +15,7 @@ commands =
   rm -f .testrepository/times.dbm
   find . -type f -name "*.py[c|o]" -delete
   ostestr --concurrency=6 {posargs}
+passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:pep8]
 commands =