diff --git a/option/dns.go b/option/dns.go
index 1a42b0f4..18e785bb 100644
--- a/option/dns.go
+++ b/option/dns.go
@@ -191,34 +191,23 @@ func (o *DNSServerOptions) Upgrade(ctx context.Context) error {
 			serverType = C.DNSTypeUDP
 		}
 	}
-	var remoteOptions RemoteDNSServerOptions
-	if options.Detour == "" {
-		remoteOptions = RemoteDNSServerOptions{
-			LocalDNSServerOptions: LocalDNSServerOptions{
-				LegacyStrategy:      options.Strategy,
-				LegacyDefaultDialer: options.Detour == "",
-				LegacyClientSubnet:  options.ClientSubnet.Build(netip.Prefix{}),
-			},
-			LegacyAddressResolver:      options.AddressResolver,
-			LegacyAddressStrategy:      options.AddressStrategy,
-			LegacyAddressFallbackDelay: options.AddressFallbackDelay,
-		}
-	} else {
-		remoteOptions = RemoteDNSServerOptions{
-			LocalDNSServerOptions: LocalDNSServerOptions{
-				DialerOptions: DialerOptions{
-					Detour: options.Detour,
-					DomainResolver: &DomainResolveOptions{
-						Server:   options.AddressResolver,
-						Strategy: options.AddressStrategy,
-					},
-					FallbackDelay: options.AddressFallbackDelay,
+	remoteOptions := RemoteDNSServerOptions{
+		LocalDNSServerOptions: LocalDNSServerOptions{
+			DialerOptions: DialerOptions{
+				Detour: options.Detour,
+				DomainResolver: &DomainResolveOptions{
+					Server:   options.AddressResolver,
+					Strategy: options.AddressStrategy,
 				},
-				LegacyStrategy:      options.Strategy,
-				LegacyDefaultDialer: options.Detour == "",
-				LegacyClientSubnet:  options.ClientSubnet.Build(netip.Prefix{}),
+				FallbackDelay: options.AddressFallbackDelay,
 			},
-		}
+			LegacyStrategy:      options.Strategy,
+			LegacyDefaultDialer: options.Detour == "",
+			LegacyClientSubnet:  options.ClientSubnet.Build(netip.Prefix{}),
+		},
+		LegacyAddressResolver:      options.AddressResolver,
+		LegacyAddressStrategy:      options.AddressStrategy,
+		LegacyAddressFallbackDelay: options.AddressFallbackDelay,
 	}
 	switch serverType {
 	case C.DNSTypeLocal: