diff --git a/proto/ospf/lsack.c b/proto/ospf/lsack.c
index 8b6b280c..acbc834c 100644
--- a/proto/ospf/lsack.c
+++ b/proto/ospf/lsack.c
@@ -195,9 +195,10 @@ ospf_lsack_rx(struct ospf_lsack_packet *ps, struct proto *p,
 
       debug("%s: Strange LS acknoledgement from %I\n",p->name,n->ip);
       debug("%s: Id: %I, Rt: %I, Type: %u\n",p->name,lsa.id,lsa.rt,lsa.type);
-      debug("%s: I have: Age: %4u, Seqno: 0x%08x\n",p->name,en->lsa.age,
-        en->lsa.sn);
-      debug("%s: He has: Age: %4u, Seqno: 0x%08x\n",p->name,lsa.age,lsa.sn);
+      debug("%s: I have: Age: %4u, Seqno: 0x%08x, Sum: %u\n",
+        p->name, en->lsa.age, en->lsa.sn, en->lsa.checksum);
+      debug("%s: He has: Age: %4u, Seqno: 0x%08x, Sum: %u\n",
+        p->name,lsa.age,lsa.sn,en->lsa.checksum);
       continue;
     }