diff --git a/tools/config/ironic-config-generator.conf b/tools/config/ironic-config-generator.conf
index eb7e064101..49e4402e5a 100644
--- a/tools/config/ironic-config-generator.conf
+++ b/tools/config/ironic-config-generator.conf
@@ -22,6 +22,7 @@ namespace = oslo.reports
 namespace = oslo.service.service
 namespace = oslo.service.periodic_task
 namespace = oslo.service.sslutils
+namespace = oslo.versionedobjects
 namespace = osprofiler
 namespace = keystonemiddleware.audit
 namespace = keystonemiddleware.auth_token