diff --git a/tools/config/generate_sample.sh b/tools/config/generate_sample.sh
index ba4f7c1b79e..842777b361d 100755
--- a/tools/config/generate_sample.sh
+++ b/tools/config/generate_sample.sh
@@ -152,7 +152,8 @@ oslo-config-generator \
 --namespace oslo.messaging \
 --namespace oslo.i18n \
 --namespace oslo.middleware \
---namespace oslo.service \
+--namespace oslo.service.service \
+--namespace oslo.service.periodic_task \
 --namespace policy \
 --namespace oslo.policy \
 --namespace oslo.db.concurrency \