diff --git a/transport/socks5/socks5.go b/transport/socks5/socks5.go
index b2bf676d..0bd7876d 100644
--- a/transport/socks5/socks5.go
+++ b/transport/socks5/socks5.go
@@ -72,7 +72,7 @@ func (r Reply) String() string {
 	case 0x08:
 		return "address type not supported"
 	default:
-		return fmt.Sprintf("unassigned <%#02x>", r)
+		return fmt.Sprintf("unassigned <%#02x>", uint8(r))
 	}
 }