diff --git a/ospf6d/ospf6_lsdb.h b/ospf6d/ospf6_lsdb.h
index a124adb..425f615 100644
--- a/ospf6d/ospf6_lsdb.h
+++ b/ospf6d/ospf6_lsdb.h
@@ -66,12 +66,15 @@
 extern void ospf6_lsdb_remove_all (struct ospf6_lsdb *lsdb);
 extern void ospf6_lsdb_lsa_unlock (struct ospf6_lsa *lsa);
 
-#define OSPF6_LSDB_SHOW_LEVEL_NORMAL   0
-#define OSPF6_LSDB_SHOW_LEVEL_DETAIL   1
-#define OSPF6_LSDB_SHOW_LEVEL_INTERNAL 2
-#define OSPF6_LSDB_SHOW_LEVEL_DUMP     3
+enum ospf_lsdb_show_level {
+ OSPF6_LSDB_SHOW_LEVEL_NORMAL = 0,
+ OSPF6_LSDB_SHOW_LEVEL_DETAIL,
+ OSPF6_LSDB_SHOW_LEVEL_INTERNAL,
+ OSPF6_LSDB_SHOW_LEVEL_DUMP,
+};
 
-extern void ospf6_lsdb_show (struct vty *vty, int level, u_int16_t *type,
+extern void ospf6_lsdb_show (struct vty *vty,
+                             enum ospf_lsdb_show_level level, u_int16_t *type,
                              u_int32_t *id, u_int32_t *adv_router,
                              struct ospf6_lsdb *lsdb);