diff --git a/doc/schemas/listchannels.schema.json b/doc/schemas/listchannels.schema.json
index 8d95dd87f..feea20285 100644
--- a/doc/schemas/listchannels.schema.json
+++ b/doc/schemas/listchannels.schema.json
@@ -10,7 +10,7 @@
       "type": "array",
       "items": {
         "type": "object",
-        "additionalProperties": true,
+        "additionalProperties": false,
         "required": [
           "source",
           "destination",