diff --git a/ospfd/ospf_spf.h b/ospfd/ospf_spf.h
index 7fe682e..7312000 100644
--- a/ospfd/ospf_spf.h
+++ b/ospfd/ospf_spf.h
@@ -33,6 +33,7 @@
   struct in_addr id;
   struct lsa_header *lsa;
   u_int32_t distance;
+  int backlink;        /* link index of back-link */
   list child;
   list nexthop;
 };
@@ -44,7 +45,7 @@
   struct vertex *parent;
 };
 
-void ospf_spf_calculate_schedule ();
+void ospf_spf_calculate_schedule (struct ospf *);
 void ospf_rtrs_free (struct route_table *);
 
 /* void ospf_spf_calculate_timer_add (); */