diff --git a/hysteria2/client.go b/hysteria2/client.go
index 904c8bc..7cd22f0 100644
--- a/hysteria2/client.go
+++ b/hysteria2/client.go
@@ -72,6 +72,7 @@ func NewClient(options ClientOptions) (*Client, error) {
 		MaxConnectionReceiveWindow:     hysteria.DefaultConnReceiveWindow,
 		MaxIdleTimeout:                 hysteria.DefaultMaxIdleTimeout,
 		KeepAlivePeriod:                hysteria.DefaultKeepAlivePeriod,
+		MaxDatagramFrameSize:           1200,
 	}
 	if len(options.TLSConfig.NextProtos()) == 0 {
 		options.TLSConfig.SetNextProtos([]string{http3.NextProtoH3})