diff --git a/proto/ospf/rt.c b/proto/ospf/rt.c
index 6ec70e1e..af1015c2 100644
--- a/proto/ospf/rt.c
+++ b/proto/ospf/rt.c
@@ -238,7 +238,14 @@ again:
   }
 skip:
   FIB_ITERATE_END(nftmp);
+}
 
+void
+ospf_ext_spfa(struct proto_ospf *po)
+{
+  struct top_hash_entry *en;
+
+  /* FIXME Go on */
 }
 
 void
diff --git a/proto/ospf/rt.h b/proto/ospf/rt.h
index da2f0381..67eca4a7 100644
--- a/proto/ospf/rt.h
+++ b/proto/ospf/rt.h
@@ -18,6 +18,7 @@ struct infib {
 };
 
 void ospf_rt_spfa(struct ospf_area *oa);
+void ospf_ext_spfa(struct proto_ospf *po);
 void add_cand(list *l, struct top_hash_entry *en, struct top_hash_entry *par,
   u16 dist, struct ospf_area *oa);
 void calc_next_hop(struct top_hash_entry *par, struct top_hash_entry *en,