diff --git a/src/database/mongo/sorted.js b/src/database/mongo/sorted.js
index 2899a86188..2f48aeb75f 100644
--- a/src/database/mongo/sorted.js
+++ b/src/database/mongo/sorted.js
@@ -360,15 +360,22 @@ module.exports = function (module) {
 		if (!Array.isArray(keys) || !keys.length) {
 			return [];
 		}
-
+		const arrayOfKeys = keys.length > 1;
+		const projection = { _id: 0, value: 1 };
+		if (arrayOfKeys) {
+			projection._key = 1;
+		}
 		const data = await module.client.collection('objects').find({
-			_key: keys.length === 1 ? keys[0] : { $in: keys },
-		}, { projection: { _id: 0, _key: 1, value: 1 } }).toArray();
+			_key: arrayOfKeys ? { $in: keys } : keys[0],
+		}, { projection: projection }).toArray();
 
-		var sets = {};
-		data.forEach(function (set) {
-			sets[set._key] = sets[set._key] || [];
-			sets[set._key].push(set.value);
+		if (!arrayOfKeys) {
+			return [data.map(item => item.value)];
+		}
+		const sets = {};
+		data.forEach(function (item) {
+			sets[item._key] = sets[item._key] || [];
+			sets[item._key].push(item.value);
 		});
 
 		return keys.map(k => sets[k] || []);
diff --git a/src/topics/unread.js b/src/topics/unread.js
index a71fdada11..c08c3eb40a 100644
--- a/src/topics/unread.js
+++ b/src/topics/unread.js
@@ -177,9 +177,9 @@ module.exports = function (Topics) {
 	}
 
 	async function getFollowedTids(params) {
-		const tids = await db.getSortedSetRevRange('uid:' + params.uid + ':followed_tids', 0, -1);
-		const scores = await db.sortedSetScores('topics:recent', tids);
-		const data = tids.map((tid, index) => ({ value: tid, score: scores[index] }));
+		const tids = await db.getSortedSetsMembers(['uid:' + params.uid + ':followed_tids']);
+		const scores = await db.sortedSetScores('topics:recent', tids[0]);
+		const data = tids[0].map((tid, index) => ({ value: tid, score: scores[index] }));
 		return data.filter(item => item.score > params.cutoff);
 	}