diff --git a/lib/conn/snappy.go b/lib/conn/snappy.go
index 7ee0619..cfd33c4 100644
--- a/lib/conn/snappy.go
+++ b/lib/conn/snappy.go
@@ -3,7 +3,6 @@ package conn
 import (
 	"github.com/cnlh/nps/lib/pool"
 	"github.com/cnlh/nps/vender/github.com/golang/snappy"
-	"github.com/fatedier/frp/utils/net"
 	"io"
 )
 
@@ -12,7 +11,7 @@ type SnappyConn struct {
 	r *snappy.Reader
 }
 
-func NewSnappyConn(conn io.ReadWriteCloser) net.Conn {
+func NewSnappyConn(conn io.ReadWriteCloser) *SnappyConn {
 	c := new(SnappyConn)
 	c.w = snappy.NewBufferedWriter(conn)
 	c.r = snappy.NewReader(conn)
diff --git a/lib/rate/conn.go b/lib/rate/conn.go
index 06856b9..7e4ef01 100644
--- a/lib/rate/conn.go
+++ b/lib/rate/conn.go
@@ -2,15 +2,14 @@ package rate
 
 import (
 	"io"
-	"net"
 )
 
 type rateConn struct {
-	conn net.Conn
+	conn io.ReadWriteCloser
 	rate *Rate
 }
 
-func NewRateConn(conn net.Conn, rate *Rate) io.ReadWriteCloser {
+func NewRateConn(conn io.ReadWriteCloser, rate *Rate) io.ReadWriteCloser {
 	return &rateConn{
 		conn: conn,
 		rate: rate,