diff --git a/src/activitypub/notes.js b/src/activitypub/notes.js
index dfe9ef2435..a8f84eea80 100644
--- a/src/activitypub/notes.js
+++ b/src/activitypub/notes.js
@@ -414,9 +414,9 @@ Notes.getParentChain = async (uid, input) => {
 };
 
 Notes.syncUserInboxes = async function (tid, uid) {
-	const [pids, { cid, mainPid }] = await Promise.all([
+	const [pids, { cid, mainPid, tags }] = await Promise.all([
 		db.getSortedSetMembers(`tid:${tid}:posts`),
-		topics.getTopicFields(tid, ['tid', 'cid', 'mainPid']),
+		topics.getTopicFields(tid, ['tid', 'cid', 'mainPid', 'tags']),
 	]);
 	pids.unshift(mainPid);
 
@@ -426,6 +426,12 @@ Notes.syncUserInboxes = async function (tid, uid) {
 		uids.add(parseInt(uid, 10));
 	}
 
+	// Tag followers
+	const tagsFollowers = await topics.getTagsFollowers(tags.map(tag => tag.value));
+	new Set(tagsFollowers.flat()).forEach((uid) => {
+		uids.add(uid);
+	});
+
 	const keys = Array.from(uids).map(uid => `uid:${uid}:inbox`);
 	const score = await db.sortedSetScore(`cid:${cid}:tids`, tid);
 
diff --git a/src/topics/tags.js b/src/topics/tags.js
index 4f2bc6dc97..378f919a16 100644
--- a/src/topics/tags.js
+++ b/src/topics/tags.js
@@ -564,6 +564,10 @@ module.exports = function (Topics) {
 		return await db.getSortedSetRange(`tag:${tag}:followers`, start, stop);
 	};
 
+	Topics.getTagsFollowers = async function (tags) {
+		return await db.getSortedSetsMembers(tags.map(tag => `tag:${tag}:followers`));
+	};
+
 	Topics.followTag = async (tag, uid) => {
 		if (!(parseInt(uid, 10) > 0)) {
 			throw new Error('[[error:not-logged-in]]');