diff --git a/constant/metadata.go b/constant/metadata.go
index 93ef406d..9fff773b 100644
--- a/constant/metadata.go
+++ b/constant/metadata.go
@@ -17,7 +17,8 @@ const (
 
 	HTTP Type = iota
 	HTTPCONNECT
-	SOCKS
+	SOCKS4
+	SOCKS5
 	REDIR
 	TPROXY
 )
@@ -43,7 +44,9 @@ func (t Type) String() string {
 		return "HTTP"
 	case HTTPCONNECT:
 		return "HTTP Connect"
-	case SOCKS:
+	case SOCKS4:
+		return "Socks4"
+	case SOCKS5:
 		return "Socks5"
 	case REDIR:
 		return "Redir"
diff --git a/listener/socks/tcp.go b/listener/socks/tcp.go
index 587af221..20e48f85 100644
--- a/listener/socks/tcp.go
+++ b/listener/socks/tcp.go
@@ -79,7 +79,7 @@ func HandleSocks4(conn net.Conn, in chan<- C.ConnContext) {
 	if c, ok := conn.(*net.TCPConn); ok {
 		c.SetKeepAlive(true)
 	}
-	in <- inbound.NewSocket(socks5.ParseAddr(addr), conn, C.SOCKS)
+	in <- inbound.NewSocket(socks5.ParseAddr(addr), conn, C.SOCKS4)
 }
 
 func HandleSocks5(conn net.Conn, in chan<- C.ConnContext) {
@@ -96,5 +96,5 @@ func HandleSocks5(conn net.Conn, in chan<- C.ConnContext) {
 		io.Copy(ioutil.Discard, conn)
 		return
 	}
-	in <- inbound.NewSocket(target, conn, C.SOCKS)
+	in <- inbound.NewSocket(target, conn, C.SOCKS5)
 }
diff --git a/listener/socks/udp.go b/listener/socks/udp.go
index ca75b2c8..f822d76a 100644
--- a/listener/socks/udp.go
+++ b/listener/socks/udp.go
@@ -70,7 +70,7 @@ func handleSocksUDP(pc net.PacketConn, in chan<- *inbound.PacketAdapter, buf []b
 		bufRef:  buf,
 	}
 	select {
-	case in <- inbound.NewPacket(target, packet, C.SOCKS):
+	case in <- inbound.NewPacket(target, packet, C.SOCKS5):
 	default:
 	}
 }