diff --git a/tox.ini b/tox.ini
index 08d1fbf6d0..b41c79f0a4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -44,6 +44,7 @@ commands =
 setenv = VIRTUAL_ENV={envdir}
          EVENTLET_NO_GREENDNS=yes
          OS_TEST_PATH=ceilometer/tests/functional/
+passenv = CEILOMETER_*
 commands =
    bash -x {toxinidir}/run-functional-tests.sh "{posargs}"