diff --git a/ospfd/ospf_dump.h b/ospfd/ospf_dump.h
index 455214f..a2d5e8b 100644
--- a/ospfd/ospf_dump.h
+++ b/ospfd/ospf_dump.h
@@ -122,6 +122,8 @@
 
 /* Message Strings. */
 extern char *ospf_lsa_type_str[];
+extern const struct message ospf_auth_type_str[];
+extern const size_t ospf_auth_type_str_max;
 
 /* Prototypes. */
 extern const char *ospf_area_name_string (struct ospf_area *);