diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index e88f60b806..bd7edf4c44 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -457,6 +457,11 @@ export class ApInboxService {
 		}
 	}
 
+	@bindThis
+	private async chatMessage(actor: MiRemoteUser, activity: IChatMessage): Promise<string> {
+		const targetUri = getApId(activity.object);
+	}
+
 	@bindThis
 	private async delete(actor: MiRemoteUser, activity: IDelete): Promise<string> {
 		if (actor.uri !== activity.actor) {