diff --git a/component/socks5/socks5.go b/component/socks5/socks5.go
index b16c3b69..1dd60391 100644
--- a/component/socks5/socks5.go
+++ b/component/socks5/socks5.go
@@ -48,8 +48,9 @@ func (a Addr) String() string {
 
 	switch a[0] {
 	case AtypDomainName:
-		host = string(a[2 : 2+int(a[1])])
-		port = strconv.Itoa((int(a[2+int(a[1])]) << 8) | int(a[2+int(a[1])+1]))
+		hostLen := uint16(a[1])
+		host = string(a[2 : 2+hostLen])
+		port = strconv.Itoa((int(a[2+hostLen]) << 8) | int(a[2+hostLen+1]))
 	case AtypIPv4:
 		host = net.IP(a[1 : 1+net.IPv4len]).String()
 		port = strconv.Itoa((int(a[1+net.IPv4len]) << 8) | int(a[1+net.IPv4len+1]))