diff --git a/src/main/java/discord4j/discordjson/json/gateway/MessageReactionAdd.java b/src/main/java/discord4j/discordjson/json/gateway/MessageReactionAdd.java
index 30b10e7c..730ded88 100644
--- a/src/main/java/discord4j/discordjson/json/gateway/MessageReactionAdd.java
+++ b/src/main/java/discord4j/discordjson/json/gateway/MessageReactionAdd.java
@@ -36,7 +36,7 @@ static ImmutableMessageReactionAdd.Builder builder() {
     EmojiData emoji();
 
     @JsonProperty("message_author_id")
-    Id messageAuthorId();
+    Possible<Id> messageAuthorId();
 
     boolean burst();