diff --git a/ospfd/ospf_flood.c b/ospfd/ospf_flood.c
index fc0bbf1..f72087b 100644
--- a/ospfd/ospf_flood.c
+++ b/ospfd/ospf_flood.c
@@ -320,7 +320,7 @@
      MinLSArrival seconds have elapsed. */  
 
   if (! (new = ospf_lsa_install (ospf, nbr->oi, new)))
-    return 0; /* unknown LSA type */
+    return -1; /* unknown LSA type or any other error condition */
 
   /* Acknowledge the receipt of the LSA by sending a Link State
      Acknowledgment packet back out the receiving interface. */