diff --git a/ospfd/ospf_lsa.h b/ospfd/ospf_lsa.h
index 6c95ff1..9ff2d92 100644
--- a/ospfd/ospf_lsa.h
+++ b/ospfd/ospf_lsa.h
@@ -243,6 +243,7 @@
 
 extern int get_age (struct ospf_lsa *);
 extern u_int16_t ospf_lsa_checksum (struct lsa_header *);
+extern int ospf_lsa_checksum_valid (struct lsa_header *);
 extern int ospf_lsa_refresh_delay (struct ospf_lsa *);
 
 extern const char *dump_lsa_key (struct ospf_lsa *);