diff --git a/bindings/kafka/0.4.0/message.json b/bindings/kafka/0.4.0/message.json
index bee7dc46..173a9bad 100644
--- a/bindings/kafka/0.4.0/message.json
+++ b/bindings/kafka/0.4.0/message.json
@@ -11,12 +11,15 @@
   },
   "properties": {
     "key": {
-      "oneOf": [
+      "anyOf": [
         {
           "$ref": "http://asyncapi.com/definitions/3.0.0/Reference.json"
         },
         {
           "$ref": "http://asyncapi.com/definitions/3.0.0/schema.json"
+        },
+        {
+          "$ref": "http://asyncapi.com/definitions/3.0.0/avroSchema_v1.json"
         }
       ],
       "description": "The message key."