diff --git a/etc/schema.json b/etc/schema.json
index 882d292f6d..4fc34c8d20 100644
--- a/etc/schema.json
+++ b/etc/schema.json
@@ -2992,9 +2992,10 @@
                             "username": {
                                 "type": "string"
                             }
-                        }
-                    }
-                }
+                        },
+                        "additionalProperties": true
+                    },
+                },
             },
             "optional": true
         },