diff --git a/v2rayN/ServiceLib/ViewModels/DNSSettingViewModel.cs b/v2rayN/ServiceLib/ViewModels/DNSSettingViewModel.cs
index e6e985ca..a679b8c1 100644
--- a/v2rayN/ServiceLib/ViewModels/DNSSettingViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/DNSSettingViewModel.cs
@@ -150,7 +150,7 @@ public class DNSSettingViewModel : MyReactiveObject
         await ConfigHandler.SaveDNSItems(_config, item1);
 
         var item2 = await AppHandler.Instance.GetDNSItem(ECoreType.sing_box);
-        item2.Enabled = RayCustomDNSEnableCompatible;
+        item2.Enabled = SBCustomDNSEnableCompatible;
         item2.DomainStrategy4Freedom = DomainStrategy4Freedom2Compatible;
         item2.DomainDNSAddress = DomainDNSAddress2Compatible;
         item2.NormalDNS = JsonUtils.Serialize(JsonUtils.ParseJson(NormalDNS2Compatible));