diff --git a/protocol/v5udp.go b/protocol/v5udp.go
index ec1f3a0..b1079b5 100644
--- a/protocol/v5udp.go
+++ b/protocol/v5udp.go
@@ -476,11 +476,9 @@ func (uc *Socks5UDPClientAssoc) Write(b []byte) (n int, err error) {
 	buf = append(buf, b...)
 
 	n, err = uc.PacketConn.Write(buf)
-	if err == nil {
-		n = max(0, n-len(uc.DefaultHeader))
-	}
+	n = max(0, n-len(uc.DefaultHeader))
 
-	return n, nil
+	return n, err
 }
 
 func (uc *Socks5UDPClientAssoc) ReadFrom(