diff --git a/packages/message-parser/src/definitions.ts b/packages/message-parser/src/definitions.ts
index 953691ec9f..e2b5840a15 100644
--- a/packages/message-parser/src/definitions.ts
+++ b/packages/message-parser/src/definitions.ts
@@ -83,7 +83,7 @@ export type Quote = {
   value: Paragraph[];
 };
 
-export type Markup = Italic | Strike | Bold | Plain | ChannelMention;
+export type Markup = Italic | Strike | Bold | Plain | ChannelMention | UserMention;
 export type MarkupExcluding<T extends Markup> = Exclude<Markup, T>;
 
 export type Bold = {