diff --git a/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua b/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua
index f03619740..47acbc66a 100644
--- a/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua
+++ b/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua
@@ -868,12 +868,12 @@ function set_ipv6_state(disable_ipv6)
 	ucic:set("firewall",ucic:get_first("firewall","defaults"),"disable_ipv6",disable_ipv6)
 	ucic:save("firewall")
 	ucic:commit("firewall")
-	if disable_ipv6 == 1 then
+	if disable_ipv6 == "1" then
 		ucic:set("dhcp","lan","ra_default","0")
 	else
 		ucic:set("dhcp","lan","ra_default","1")
 	end
-	if disable_ipv6 == 1 then
+	if disable_ipv6 == "1" then
 		luci.sys.call("uci -q del dhcp.lan.dhcpv6")
 		luci.sys.call("uci -q del dhcp.lan.ra")
 		ucic:set("shadowsocks-libev","hi","local_address","0.0.0.0")