diff --git a/SocketIOClientSwift/SocketAnyEvent.swift b/SocketIOClientSwift/SocketAnyEvent.swift
index e0ddfe2..55d88a8 100644
--- a/SocketIOClientSwift/SocketAnyEvent.swift
+++ b/SocketIOClientSwift/SocketAnyEvent.swift
@@ -24,7 +24,7 @@
 
 import Foundation
 
-@objc public class SocketAnyEvent {
+@objc public final class SocketAnyEvent {
     public let event:String!
     public var items:[AnyObject]?
     
diff --git a/SocketIOClientSwift/SocketEngine.swift b/SocketIOClientSwift/SocketEngine.swift
index 8b997e7..b66c0dc 100644
--- a/SocketIOClientSwift/SocketEngine.swift
+++ b/SocketIOClientSwift/SocketEngine.swift
@@ -30,7 +30,7 @@ extension String {
     }
 }
 
-public class SocketEngine: NSObject, WebSocketDelegate {
+public final class SocketEngine: NSObject, WebSocketDelegate {
     private typealias Probe = (msg:String, type:PacketType, data:ContiguousArray<NSData>?)
     private typealias ProbeWaitQueue = [Probe]
     
diff --git a/SocketIOClientSwift/SocketParser.swift b/SocketIOClientSwift/SocketParser.swift
index 50203c2..822467f 100644
--- a/SocketIOClientSwift/SocketParser.swift
+++ b/SocketIOClientSwift/SocketParser.swift
@@ -26,7 +26,7 @@ class SocketParser {
     private static let shredder = SocketParser.PacketShredder()
     
     // Translation of socket.io-parser#deconstructPacket
-    private class PacketShredder {
+    private final class PacketShredder {
         var buf = ContiguousArray<NSData>()
         
         func shred(data:AnyObject) -> AnyObject {