diff --git a/package/network/ipv6/odhcp6c/files/dhcpv6.sh b/package/network/ipv6/odhcp6c/files/dhcpv6.sh
index 07259735ff..d8adb71696 100755
--- a/package/network/ipv6/odhcp6c/files/dhcpv6.sh
+++ b/package/network/ipv6/odhcp6c/files/dhcpv6.sh
@@ -16,6 +16,8 @@ proto_dhcpv6_init_config() {
 	proto_config_add_string iface_dslite
 	proto_config_add_string 'ifaceid:ip6addr'
 	proto_config_add_string 'sourcerouting:bool'
+	proto_config_add_string "userclass"
+	proto_config_add_string "vendorclass"
 }
 
 proto_dhcpv6_setup() {