diff --git a/ospf6d/ospf6_lsa.h b/ospf6d/ospf6_lsa.h
index 7d93f5c..263411f 100644
--- a/ospf6d/ospf6_lsa.h
+++ b/ospf6d/ospf6_lsa.h
@@ -237,6 +237,7 @@
 extern int ospf6_lsa_refresh (struct thread *);
 
 extern unsigned short ospf6_lsa_checksum (struct ospf6_lsa_header *);
+extern int ospf6_lsa_checksum_valid (struct ospf6_lsa_header *);
 extern int ospf6_lsa_prohibited_duration (u_int16_t type, u_int32_t id,
                                           u_int32_t adv_router, void *scope);