diff --git a/src/socket.io/index.js b/src/socket.io/index.js
index 773f885791..4d88ed51ee 100644
--- a/src/socket.io/index.js
+++ b/src/socket.io/index.js
@@ -26,10 +26,6 @@ Sockets.init = async function (server) {
 	});
 
 	if (nconf.get('isCluster')) {
-		// socket.io-adapter-cluster needs update
-		// if (nconf.get('singleHostCluster')) {
-		// 	io.adapter(require('./single-host-cluster'));
-		// } else if (nconf.get('redis')) {
 		if (nconf.get('redis')) {
 			const adapter = await require('../database/redis').socketAdapter();
 			io.adapter(adapter);
diff --git a/src/socket.io/single-host-cluster.js b/src/socket.io/single-host-cluster.js
deleted file mode 100644
index ca420997c5..0000000000
--- a/src/socket.io/single-host-cluster.js
+++ /dev/null
@@ -1,65 +0,0 @@
-'use strict';
-
-const Client = {
-	sendMessage: function (channel, message) {
-		process.send({
-			action: 'socket.io',
-			channel: channel,
-			message: message,
-		});
-	},
-	trigger: function (channel, message) {
-		Client.message.concat(Client.pmessage).forEach((callback) => {
-			setImmediate(() => {
-				callback.call(Client, channel, message);
-			});
-		});
-	},
-	publish: function (channel, message) {
-		Client.sendMessage(channel, message);
-	},
-	// we don't actually care about which channels we're subscribed to
-	subscribe: function () {},
-	psubscribe: function () {},
-	unsubscribe: function () {},
-	unpsubscribe: function () {},
-	message: [],
-	pmessage: [],
-	on: function (event, callback) {
-		if (event !== 'message' && event !== 'pmessage') {
-			return;
-		}
-		Client[event].push(callback);
-	},
-	off: function (event, callback) {
-		if (event !== 'message' && event !== 'pmessage') {
-			return;
-		}
-		if (callback) {
-			Client[event] = Client[event].filter(c => c !== callback);
-		} else {
-			Client[event] = [];
-		}
-	},
-};
-
-process.on('message', (message) => {
-	if (message && typeof message === 'object' && message.action === 'socket.io') {
-		Client.trigger(message.channel, message.message);
-	}
-});
-
-const adapter = require('socket.io-adapter-cluster')({
-	client: Client,
-});
-// Otherwise, every node thinks it is the master node and ignores messages
-// because they are from "itself".
-Object.defineProperty(adapter.prototype, 'id', {
-	get: function () {
-		return process.pid;
-	},
-	set: function () {
-		// ignore
-	},
-});
-module.exports = adapter;