diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index d7079097..1639592f 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -1029,12 +1029,11 @@ namespace ServiceLib.Handler
         public static async Task<ProfileItem?> GetPreSocksItem(Config config, ProfileItem node, ECoreType coreType)
         {
             ProfileItem? itemSocks = null;
-            var preCoreType = ECoreType.sing_box;
             if (node.ConfigType != EConfigType.Custom && coreType != ECoreType.sing_box && config.TunModeItem.EnableTun)
             {
                 itemSocks = new ProfileItem()
                 {
-                    CoreType = preCoreType,
+                    CoreType = ECoreType.sing_box,
                     ConfigType = EConfigType.SOCKS,
                     Address = Global.Loopback,
                     Sni = node.Address, //Tun2SocksAddress
@@ -1043,7 +1042,7 @@ namespace ServiceLib.Handler
             }
             else if ((node.ConfigType == EConfigType.Custom && node.PreSocksPort > 0))
             {
-                preCoreType = config.TunModeItem.EnableTun ? ECoreType.sing_box : ECoreType.Xray;
+                var preCoreType = config.RunningCoreType = config.TunModeItem.EnableTun ? ECoreType.sing_box : ECoreType.Xray;
                 itemSocks = new ProfileItem()
                 {
                     CoreType = preCoreType,
diff --git a/v2rayN/ServiceLib/Handler/CoreHandler.cs b/v2rayN/ServiceLib/Handler/CoreHandler.cs
index 78bc505e..60c7175a 100644
--- a/v2rayN/ServiceLib/Handler/CoreHandler.cs
+++ b/v2rayN/ServiceLib/Handler/CoreHandler.cs
@@ -174,7 +174,7 @@ namespace ServiceLib.Handler
                 var itemSocks = await ConfigHandler.GetPreSocksItem(_config, node, coreType);
                 if (itemSocks != null)
                 {
-                    var preCoreType = _config.RunningCoreType = itemSocks.CoreType ?? ECoreType.sing_box;
+                    var preCoreType = itemSocks.CoreType ?? ECoreType.sing_box;
                     var fileName = Utils.GetConfigPath(Global.CorePreConfigFileName);
                     var result = await CoreConfigHandler.GenerateClientConfig(itemSocks, fileName);
                     if (result.Success)