diff --git a/SocketIO-MacTests/SocketSideEffectTest.swift b/SocketIO-MacTests/SocketSideEffectTest.swift
index d913b82..c427cb9 100644
--- a/SocketIO-MacTests/SocketSideEffectTest.swift
+++ b/SocketIO-MacTests/SocketSideEffectTest.swift
@@ -319,7 +319,7 @@ class SocketSideEffectTest: XCTestCase {
             expect.fulfill()
         }
 
-        socket.emitWithAck("myEvent", ThrowingData()).timingOut(after: 1, callback: {_ in
+        socket.emitWithAck("myEvent", ThrowingData()).timingOut(after: 0.8, callback: {_ in
             XCTFail("Ack callback should not be called")
         })
 
diff --git a/Source/SocketAckEmitter.swift b/Source/SocketAckEmitter.swift
index cdff4a8..ea82ab0 100644
--- a/Source/SocketAckEmitter.swift
+++ b/Source/SocketAckEmitter.swift
@@ -104,7 +104,7 @@ public final class OnAckCallback : NSObject {
     /// - parameter after: The number of seconds before this emit times out if an ack hasn't been received.
     /// - parameter callback: The callback called when an ack is received, or when a timeout happens.
     ///                       To check for timeout, use `SocketAckStatus`'s `noAck` case.
-    public func timingOut(after seconds: Int, callback: @escaping AckCallback) {
+    public func timingOut(after seconds: Double, callback: @escaping AckCallback) {
         guard let socket = self.socket, ackNumber != -1 else { return }
 
         socket.ackHandlers.addAck(ackNumber, callback: callback)
@@ -112,7 +112,7 @@ public final class OnAckCallback : NSObject {
 
         guard seconds != 0 else { return }
 
-        socket.handleQueue.asyncAfter(deadline: DispatchTime.now() + Double(seconds)) {
+        socket.handleQueue.asyncAfter(deadline: DispatchTime.now() + seconds) {
             socket.ackHandlers.timeoutAck(self.ackNumber, onQueue: socket.handleQueue)
         }
     }