diff --git a/pkg/obfs/dummy.go b/pkg/obfs/dummy.go
new file mode 100644
index 0000000..3edff10
--- /dev/null
+++ b/pkg/obfs/dummy.go
@@ -0,0 +1,18 @@
+package obfs
+
+type DummyObfuscator struct{}
+
+func NewDummyObfuscator() *DummyObfuscator {
+	return &DummyObfuscator{}
+}
+
+func (x *DummyObfuscator) Deobfuscate(in []byte, out []byte) int {
+	if len(out) < len(in) {
+		return 0
+	}
+	return copy(out, in)
+}
+
+func (x *DummyObfuscator) Obfuscate(in []byte, out []byte) int {
+	return copy(out, in)
+}
diff --git a/pkg/transport/client.go b/pkg/transport/client.go
index 6746ab9..bfd0340 100644
--- a/pkg/transport/client.go
+++ b/pkg/transport/client.go
@@ -9,7 +9,7 @@ import (
 	"github.com/HyNetwork/hysteria/pkg/conns/faketcp"
 	"github.com/HyNetwork/hysteria/pkg/conns/udp"
 	"github.com/HyNetwork/hysteria/pkg/conns/wechat"
-	"github.com/HyNetwork/hysteria/pkg/obfs"
+	obfsPkg "github.com/HyNetwork/hysteria/pkg/obfs"
 	"github.com/lucas-clemente/quic-go"
 )
 
@@ -25,7 +25,7 @@ var DefaultClientTransport = &ClientTransport{
 	ResolvePreference: ResolvePreferenceDefault,
 }
 
-func (ct *ClientTransport) quicPacketConn(proto string, server string, obfs obfs.Obfuscator) (net.PacketConn, error) {
+func (ct *ClientTransport) quicPacketConn(proto string, server string, obfs obfsPkg.Obfuscator) (net.PacketConn, error) {
 	if len(proto) == 0 || proto == "udp" {
 		conn, err := net.ListenUDP("udp", nil)
 		if err != nil {
@@ -42,12 +42,10 @@ func (ct *ClientTransport) quicPacketConn(proto string, server string, obfs obfs
 		if err != nil {
 			return nil, err
 		}
-		if obfs != nil {
-			oc := wechat.NewObfsWeChatUDPConn(conn, obfs)
-			return oc, nil
-		} else {
-			return conn, nil
+		if obfs == nil {
+			obfs = obfsPkg.NewDummyObfuscator()
 		}
+		return wechat.NewObfsWeChatUDPConn(conn, obfs), nil
 	} else if proto == "faketcp" {
 		var conn *faketcp.TCPConn
 		conn, err := faketcp.Dial("tcp", server)
@@ -65,7 +63,7 @@ func (ct *ClientTransport) quicPacketConn(proto string, server string, obfs obfs
 	}
 }
 
-func (ct *ClientTransport) QUICDial(proto string, server string, tlsConfig *tls.Config, quicConfig *quic.Config, obfs obfs.Obfuscator) (quic.Connection, error) {
+func (ct *ClientTransport) QUICDial(proto string, server string, tlsConfig *tls.Config, quicConfig *quic.Config, obfs obfsPkg.Obfuscator) (quic.Connection, error) {
 	serverUDPAddr, err := net.ResolveUDPAddr("udp", server)
 	if err != nil {
 		return nil, err
diff --git a/pkg/transport/server.go b/pkg/transport/server.go
index 6c297ef..24b3ffa 100644
--- a/pkg/transport/server.go
+++ b/pkg/transport/server.go
@@ -10,7 +10,7 @@ import (
 	"github.com/HyNetwork/hysteria/pkg/conns/faketcp"
 	"github.com/HyNetwork/hysteria/pkg/conns/udp"
 	"github.com/HyNetwork/hysteria/pkg/conns/wechat"
-	"github.com/HyNetwork/hysteria/pkg/obfs"
+	obfsPkg "github.com/HyNetwork/hysteria/pkg/obfs"
 	"github.com/HyNetwork/hysteria/pkg/sockopt"
 	"github.com/HyNetwork/hysteria/pkg/utils"
 	"github.com/lucas-clemente/quic-go"
@@ -76,7 +76,7 @@ var DefaultServerTransport = &ServerTransport{
 	ResolvePreference: ResolvePreferenceDefault,
 }
 
-func (st *ServerTransport) quicPacketConn(proto string, laddr string, obfs obfs.Obfuscator) (net.PacketConn, error) {
+func (st *ServerTransport) quicPacketConn(proto string, laddr string, obfs obfsPkg.Obfuscator) (net.PacketConn, error) {
 	if len(proto) == 0 || proto == "udp" {
 		laddrU, err := net.ResolveUDPAddr("udp", laddr)
 		if err != nil {
@@ -101,12 +101,10 @@ func (st *ServerTransport) quicPacketConn(proto string, laddr string, obfs obfs.
 		if err != nil {
 			return nil, err
 		}
-		if obfs != nil {
-			oc := wechat.NewObfsWeChatUDPConn(conn, obfs)
-			return oc, nil
-		} else {
-			return conn, nil
+		if obfs == nil {
+			obfs = obfsPkg.NewDummyObfuscator()
 		}
+		return wechat.NewObfsWeChatUDPConn(conn, obfs), nil
 	} else if proto == "faketcp" {
 		conn, err := faketcp.Listen("tcp", laddr)
 		if err != nil {
@@ -123,7 +121,7 @@ func (st *ServerTransport) quicPacketConn(proto string, laddr string, obfs obfs.
 	}
 }
 
-func (st *ServerTransport) QUICListen(proto string, listen string, tlsConfig *tls.Config, quicConfig *quic.Config, obfs obfs.Obfuscator) (quic.Listener, error) {
+func (st *ServerTransport) QUICListen(proto string, listen string, tlsConfig *tls.Config, quicConfig *quic.Config, obfs obfsPkg.Obfuscator) (quic.Listener, error) {
 	pktConn, err := st.quicPacketConn(proto, listen, obfs)
 	if err != nil {
 		return nil, err