diff --git a/src/activitypub/index.js b/src/activitypub/index.js
index 4670d94546..4a5bec8f4c 100644
--- a/src/activitypub/index.js
+++ b/src/activitypub/index.js
@@ -8,7 +8,6 @@ const request = require('../request');
 const db = require('../database');
 const meta = require('../meta');
 const categories = require('../categories');
-const topics = require('../topics');
 const posts = require('../posts');
 const messaging = require('../messaging');
 const user = require('../user');
@@ -521,7 +520,7 @@ ActivityPub.buildRecipients = async function (object, options) {
 	// Topic posters, post announcers and their followers
 	if (pid) {
 		const tid = await posts.getPostField(pid, 'tid');
-		const participants = (await topics.getUids(tid))
+		const participants = (await db.getSortedSetMembers(`tid:${tid}:posters`))
 			.filter(uid => !utils.isNumber(uid)); // remote users only
 		const announcers = (await ActivityPub.notes.announce.list({ pid })).map(({ actor }) => actor);
 		const auxiliaries = Array.from(new Set([...participants, ...announcers]));
diff --git a/src/topics/user.js b/src/topics/user.js
index f7d13f50ea..7a2265512c 100644
--- a/src/topics/user.js
+++ b/src/topics/user.js
@@ -2,7 +2,6 @@
 
 const db = require('../database');
 const utils = require('../utils');
-const cache = require('../cache');
 
 module.exports = function (Topics) {
 	Topics.isOwner = async function (tid, uid) {
@@ -14,13 +13,6 @@ module.exports = function (Topics) {
 	};
 
 	Topics.getUids = async function (tid) {
-		const cacheKey = `tid:${tid}:uids`;
-		let posters = cache.get(cacheKey, tid);
-		if (!posters) {
-			posters = await db.getSortedSetRevRangeByScore(`tid:${tid}:posters`, 0, -1, '+inf', 1);
-			cache.set(cacheKey, posters);
-		}
-
-		return posters;
+		return await db.getSortedSetRevRangeByScore(`tid:${tid}:posters`, 0, -1, '+inf', 1);
 	};
 };