diff --git a/Source/SocketIOClient.swift b/Source/SocketIOClient.swift
index 5d36444..99fa5f8 100644
--- a/Source/SocketIOClient.swift
+++ b/Source/SocketIOClient.swift
@@ -46,7 +46,7 @@ public final class SocketIOClient : NSObject, SocketEngineClient, SocketParsable
     public var reconnects = true
     public var reconnectWait = 10
     public var sid: String? {
-        return engine?.sid
+        return nsp + "#" + (engine?.sid ?? "")
     }
 
     private let emitQueue = dispatch_queue_create("com.socketio.emitQueue", DISPATCH_QUEUE_SERIAL)