diff --git a/ShadowsocksX-NG/AppDelegate.swift b/ShadowsocksX-NG/AppDelegate.swift
index 2a631f9..0a19220 100755
--- a/ShadowsocksX-NG/AppDelegate.swift
+++ b/ShadowsocksX-NG/AppDelegate.swift
@@ -120,7 +120,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
                 self.updateCopyHttpProxyExportMenu()
             })
         
-        notifyCenter.addObserver(forName: NSNotification.Name(rawValue: NOTIFY_SERVER_PROFILES_CHANGED), object: nil, queue: nil
+        notifyCenter.addObserver(forName: NOTIFY_SERVER_PROFILES_CHANGED, object: nil, queue: nil
             , using: {
                 (note) in
                 let profileMgr = ServerProfileManager.instance
diff --git a/ShadowsocksX-NG/Notifications.swift b/ShadowsocksX-NG/Notifications.swift
index 3778826..974910c 100644
--- a/ShadowsocksX-NG/Notifications.swift
+++ b/ShadowsocksX-NG/Notifications.swift
@@ -8,8 +8,7 @@
 
 import Foundation
 
-let NOTIFY_SERVER_PROFILES_CHANGED = "NOTIFY_SERVER_PROFILES_CHANGED"
-let NOTIFY_INVALIDE_QR = "NOTIFY_INVALIDE_QR"
+let NOTIFY_SERVER_PROFILES_CHANGED = Notification.Name(rawValue: "NOTIFY_SERVER_PROFILES_CHANGED")
 
 let NOTIFY_CONF_CHANGED = Notification.Name(rawValue: "NOTIFY_CONF_CHANGED")
 
diff --git a/ShadowsocksX-NG/PreferencesWindowController.swift b/ShadowsocksX-NG/PreferencesWindowController.swift
index f6375f6..ebe4481 100644
--- a/ShadowsocksX-NG/PreferencesWindowController.swift
+++ b/ShadowsocksX-NG/PreferencesWindowController.swift
@@ -145,7 +145,7 @@ class PreferencesWindowController: NSWindowController
 
         
         NotificationCenter.default
-            .post(name: Notification.Name(rawValue: NOTIFY_SERVER_PROFILES_CHANGED), object: nil)
+            .post(name: NOTIFY_SERVER_PROFILES_CHANGED, object: nil)
     }
     
     @IBAction func cancel(_ sender: NSButton) {
diff --git a/ShadowsocksX-NG/ServerProfileManager.swift b/ShadowsocksX-NG/ServerProfileManager.swift
index dbed875..b0c8467 100644
--- a/ShadowsocksX-NG/ServerProfileManager.swift
+++ b/ShadowsocksX-NG/ServerProfileManager.swift
@@ -107,7 +107,7 @@ class ServerProfileManager: NSObject {
                     self.profiles.append(profile)
                     self.save()
                 }
-                NotificationCenter.default.post(name: NSNotification.Name(rawValue: NOTIFY_SERVER_PROFILES_CHANGED), object: nil)
+                NotificationCenter.default.post(name: NOTIFY_SERVER_PROFILES_CHANGED, object: nil)
                 let configsCount = (jsonArr1.object(forKey: "configs") as! [[String: AnyObject]]).count
                 let notification = NSUserNotification()
                 notification.title = "Import Server Profile succeed!".localized