diff --git a/hysteria2/client.go b/hysteria2/client.go
index df3dd00..bd5b529 100644
--- a/hysteria2/client.go
+++ b/hysteria2/client.go
@@ -13,6 +13,7 @@ import (
 
 	"github.com/sagernet/quic-go"
 	"github.com/sagernet/quic-go/congestion"
+	"github.com/sagernet/quic-go/http3"
 	"github.com/sagernet/sing-quic"
 	congestion_meta1 "github.com/sagernet/sing-quic/congestion_meta1"
 	congestion_meta2 "github.com/sagernet/sing-quic/congestion_meta2"
@@ -72,6 +73,9 @@ func NewClient(options ClientOptions) (*Client, error) {
 		MaxIdleTimeout:                 hysteria.DefaultMaxIdleTimeout,
 		KeepAlivePeriod:                hysteria.DefaultKeepAlivePeriod,
 	}
+	if len(options.TLSConfig.NextProtos()) == 0 {
+		options.TLSConfig.SetNextProtos([]string{http3.NextProtoH3})
+	}
 	return &Client{
 		ctx:                options.Context,
 		dialer:             options.Dialer,
diff --git a/hysteria2/service.go b/hysteria2/service.go
index 4e477bc..e8b65d8 100644
--- a/hysteria2/service.go
+++ b/hysteria2/service.go
@@ -82,6 +82,9 @@ func NewService[U comparable](options ServiceOptions) (*Service[U], error) {
 	if options.MasqueradeHandler == nil {
 		options.MasqueradeHandler = http.NotFoundHandler()
 	}
+	if len(options.TLSConfig.NextProtos()) == 0 {
+		options.TLSConfig.SetNextProtos([]string{http3.NextProtoH3})
+	}
 	return &Service[U]{
 		ctx:                   options.Context,
 		logger:                options.Logger,