diff --git a/package/network/ipv6/odhcp6c/files/dhcpv6.script b/package/network/ipv6/odhcp6c/files/dhcpv6.script
index 7a7f76f833..42c67c19c2 100755
--- a/package/network/ipv6/odhcp6c/files/dhcpv6.script
+++ b/package/network/ipv6/odhcp6c/files/dhcpv6.script
@@ -77,6 +77,7 @@ setup_interface () {
 
 	proto_add_data
 	[ -n "$CER" ] && json_add_string cer "$CER"
+	[ -n "$PASSTHRU" ] && json_add_string passthru "$PASSTHRU"
 	proto_close_data
 
 	proto_send_update "$INTERFACE"