diff --git a/README.md b/README.md
index 6e067bc..5913e5e 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ socket.on("currentAmount") {data, ack in
             socket.emit("update", ["amount": cur + 2.50])
         }
 
-        ack?.with("Got your currentAmount", "dude")
+        ack.with("Got your currentAmount", "dude")
     }
 }
 
diff --git a/SocketIOClientSwift/SocketAckEmitter.swift b/SocketIOClientSwift/SocketAckEmitter.swift
index 623c852..6303175 100644
--- a/SocketIOClientSwift/SocketAckEmitter.swift
+++ b/SocketIOClientSwift/SocketAckEmitter.swift
@@ -34,10 +34,14 @@ public final class SocketAckEmitter: NSObject {
     }
     
     public func with(items: AnyObject...) {
+        guard ackNum != -1 else {return}
+        
         socket.emitAck(ackNum, withItems: items)
     }
     
     public func with(items: [AnyObject]) {
+        guard ackNum != -1 else {return}
+        
         socket.emitAck(ackNum, withItems: items)
     }
 }
diff --git a/SocketIOClientSwift/SocketEventHandler.swift b/SocketIOClientSwift/SocketEventHandler.swift
index 9f2ee68..df7d78b 100644
--- a/SocketIOClientSwift/SocketEventHandler.swift
+++ b/SocketIOClientSwift/SocketEventHandler.swift
@@ -24,16 +24,12 @@
 
 import Foundation
 
-private func emitAckCallback(socket: SocketIOClient, num: Int) -> SocketAckEmitter? {
-    return num != -1 ? SocketAckEmitter(socket: socket, ackNum: num) : nil
-}
-
 struct SocketEventHandler {
     let event: String
     let id: NSUUID
     let callback: NormalCallback
     
-    func executeCallback(items: [AnyObject], withAck ack: Int = -1, withSocket socket: SocketIOClient) {
-                self.callback(items, emitAckCallback(socket, num: ack))
+    func executeCallback(items: [AnyObject], withAck ack: Int, withSocket socket: SocketIOClient) {
+        self.callback(items, SocketAckEmitter(socket: socket, ackNum: ack))
     }
 }
diff --git a/SocketIOClientSwift/SocketTypes.swift b/SocketIOClientSwift/SocketTypes.swift
index 86bdeee..b8840be 100644
--- a/SocketIOClientSwift/SocketTypes.swift
+++ b/SocketIOClientSwift/SocketTypes.swift
@@ -25,7 +25,7 @@
 import Foundation
 
 public typealias AckCallback = ([AnyObject]) -> Void
-public typealias NormalCallback = ([AnyObject], SocketAckEmitter?) -> Void
+public typealias NormalCallback = ([AnyObject], SocketAckEmitter) -> Void
 public typealias OnAckCallback = (timeoutAfter: UInt64, callback: AckCallback) -> Void
 
 enum Either<E, V> {