diff --git a/src/user/notifications.js b/src/user/notifications.js
index 244cee7ba0..355dac53a2 100644
--- a/src/user/notifications.js
+++ b/src/user/notifications.js
@@ -3,6 +3,7 @@
 
 var async = require('async');
 var winston = require('winston');
+var _ = require('lodash');
 
 var db = require('../database');
 var meta = require('../meta');
@@ -45,17 +46,11 @@ function filterNotifications(nids, filter, callback) {
 	}
 	async.waterfall([
 		function (next) {
-			var keys = nids.map(function (nid) {
-				return 'notifications:' + nid;
-			});
+			const keys = nids.map(nid => 'notifications:' + nid);
 			db.getObjectsFields(keys, ['nid', 'type'], next);
 		},
 		function (notifications, next) {
-			nids = notifications.filter(function (notification) {
-				return notification && notification.nid && notification.type === filter;
-			}).map(function (notification) {
-				return notification.nid;
-			});
+			nids = notifications.filter(n => n && n.nid && n.type === filter).map(n => n.nid);
 			next(null, nids);
 		},
 	], callback);
@@ -65,17 +60,13 @@ UserNotifications.getAll = function (uid, filter, callback) {
 	var nids;
 	async.waterfall([
 		function (next) {
-			async.parallel({
-				unread: function (next) {
-					db.getSortedSetRevRange('uid:' + uid + ':notifications:unread', 0, -1, next);
-				},
-				read: function (next) {
-					db.getSortedSetRevRange('uid:' + uid + ':notifications:read', 0, -1, next);
-				},
-			}, next);
+			db.getSortedSetRevRange([
+				'uid:' + uid + ':notifications:unread',
+				'uid:' + uid + ':notifications:read',
+			], 0, -1, next);
 		},
-		function (results, next) {
-			nids = results.unread.concat(results.read);
+		function (_nids, next) {
+			nids = _.uniq(_nids);
 			db.isSortedSetMembers('notifications', nids, next);
 		},
 		function (exists, next) {
@@ -183,17 +174,12 @@ UserNotifications.getUnreadCount = function (uid, callback) {
 			notifications.filterExists(nids, next);
 		},
 		function (nids, next) {
-			var keys = nids.map(function (nid) {
-				return 'notifications:' + nid;
-			});
-
+			const keys = nids.map(nid => 'notifications:' + nid);
 			db.getObjectsFields(keys, ['mergeId'], next);
 		},
 		function (mergeIds, next) {
 			// Collapse any notifications with identical mergeIds
-			mergeIds = mergeIds.map(function (set) {
-				return set.mergeId;
-			});
+			mergeIds = mergeIds.map(set => set.mergeId);
 
 			next(null, mergeIds.reduce(function (count, mergeId, idx, arr) {
 				// A missing (null) mergeId means that notification is counted separately.
@@ -219,15 +205,12 @@ UserNotifications.getUnreadByField = function (uid, field, values, callback) {
 				return callback(null, []);
 			}
 
-			var keys = nids.map(nid => 'notifications:' + nid);
+			const keys = nids.map(nid => 'notifications:' + nid);
 			db.getObjectsFields(keys, ['nid', field], next);
 		},
 		function (notifications, next) {
 			const valuesSet = new Set(values.map(value => String(value)));
-			nids = notifications.filter(function (notification) {
-				return notification && notification[field] && valuesSet.has(String(notification[field]));
-			}).map(notification => notification.nid);
-
+			nids = notifications.filter(n => n && n[field] && valuesSet.has(String(n[field]))).map(n => n.nid);
 			next(null, nids);
 		},
 	], callback);
@@ -237,13 +220,9 @@ UserNotifications.deleteAll = function (uid, callback) {
 	if (parseInt(uid, 10) <= 0) {
 		return setImmediate(callback);
 	}
-	async.parallel([
-		function (next) {
-			db.delete('uid:' + uid + ':notifications:unread', next);
-		},
-		function (next) {
-			db.delete('uid:' + uid + ':notifications:read', next);
-		},
+	db.deleteAll([
+		'uid:' + uid + ':notifications:unread',
+		'uid:' + uid + ':notifications:read',
 	], callback);
 };