diff --git a/shadowsocks-libev/files/shadowsocks-libev.init b/shadowsocks-libev/files/shadowsocks-libev.init
index 4bb1c68d3..a2f5e7ca7 100644
--- a/shadowsocks-libev/files/shadowsocks-libev.init
+++ b/shadowsocks-libev/files/shadowsocks-libev.init
@@ -149,6 +149,7 @@ ss_rules() {
 	local bin6="$ss_bindir/ss-rules6"
 	local cfgtype
 	local local_port_tcp local_port_udp
+	local local_port_tcp6 local_port_udp6
 	local args
 
 	[ -x "$bin" ] || return 1