diff --git a/src/activitypub/notes.js b/src/activitypub/notes.js
index c8ea0ceef5..057c41efe2 100644
--- a/src/activitypub/notes.js
+++ b/src/activitypub/notes.js
@@ -221,7 +221,7 @@ Notes.updateTopicCounts = async function (tid) {
 Notes.syncUserInboxes = async function (tid) {
 	const [pids, { cid, mainPid }] = await Promise.all([
 		db.getSortedSetMembers(`tid:${tid}:posts`),
-		topics.getTopicFields(tid, ['cid', 'mainPid']),
+		topics.getTopicFields(tid, ['tid', 'cid', 'mainPid']),
 	]);
 	pids.unshift(mainPid);