diff --git a/packages/backend/src/core/MessagingService.ts b/packages/backend/src/core/MessagingService.ts
index b36f8e105f..bb3671c8b0 100644
--- a/packages/backend/src/core/MessagingService.ts
+++ b/packages/backend/src/core/MessagingService.ts
@@ -141,6 +141,7 @@ export class MessagingService {
 				userId: message.userId,
 				visibility: 'specified',
 				emojis: [{}],
+				tags: [{}],
 				mentions: [recipientUser].map(u => u.id),
 				mentionedRemoteUsers: JSON.stringify([recipientUser].map(u => ({
 					uri: u.uri,