diff --git a/tox.ini b/tox.ini
index 94a98200..10377ccd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,7 @@ setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --testr-args="{posargs}"
+passenv = SWIFT_* *_proxy
 
 [testenv:pep8]
 commands =