diff --git a/config/schemas/config.yaml b/config/schemas/config.yaml
index b3cd0f3a2..e09692731 100644
--- a/config/schemas/config.yaml
+++ b/config/schemas/config.yaml
@@ -4234,6 +4234,4 @@ properties:
           AWS route53 can not handle CNAME records and TXT with the same name.
           When --aws-prefer-cname is used, add a prefix to make it work.
     type: object
-additionalProperties:
-  type: object
-  properties: {}
+additionalProperties: false