diff --git a/proto/ospf/lsupd.c b/proto/ospf/lsupd.c
index a5da425..f3c2d81 100644
--- a/proto/ospf/lsupd.c
+++ b/proto/ospf/lsupd.c
@@ -598,9 +598,7 @@ ospf_lsupd_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
 	{
 	  OSPF_TRACE(D_EVENTS, "Premature aging it");
 	  lsatmp.age = LSA_MAXAGE;
-	  lsatmp.sn = LSA_MAXSEQNO;
 	  lsa->age = htons(LSA_MAXAGE);
-	  lsa->sn = htonl(LSA_MAXSEQNO);
 	  lsasum_check(lsa, (lsa + 1));	/* It also calculates chsum! */
 	  lsatmp.checksum = ntohs(lsa->checksum);
 	  ospf_lsupd_flood(po, NULL, lsa, &lsatmp, domain, 0);
@@ -742,7 +740,6 @@ ospf_lsupd_flush_nlsa(struct proto_ospf *po, struct top_hash_entry *en)
   struct proto *p = &po->proto;
 
   lsa->age = LSA_MAXAGE;
-  lsa->sn = LSA_MAXSEQNO;
   lsasum_calculate(lsa, en->lsa_body);
   OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa!");
   OSPF_TRACE(D_EVENTS, "Type: %04x, Id: %R, Rt: %R", lsa->type, lsa->id, lsa->rt);
diff --git a/proto/ospf/topology.c b/proto/ospf/topology.c
index 5d93c0e..a2deee0 100644
--- a/proto/ospf/topology.c
+++ b/proto/ospf/topology.c
@@ -930,7 +930,7 @@ check_ext_lsa(struct top_hash_entry *en, struct fib_node *fn, u32 metric, ip_add
   if  (fn->pxlen != ipa_mklen(ext->netmask))
     return -1;
 
-  return (en->lsa.sn != LSA_MAXSEQNO) && (ext->metric == metric) &&
+  return (en->lsa.age != LSA_MAXAGE) && (ext->metric == metric) &&
     (ext->tag == tag) && ipa_equal(ext->fwaddr,fwaddr);
 }