diff --git a/tox.ini b/tox.ini
index 130d41a14d..2c9fedacf5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,6 +49,7 @@ commands =
 commands =
     oslo-config-generator --output-file etc/ceilometer/ceilometer.conf \
     --namespace ceilometer \
+    --namespace oslo.concurrency \
     --namespace oslo.db \
     --namespace oslo.messaging \
     --namespace keystonemiddleware.auth_token