diff --git a/ospfd/ospf_route.h b/ospfd/ospf_route.h
index 8aee559..351e014 100644
--- a/ospfd/ospf_route.h
+++ b/ospfd/ospf_route.h
@@ -121,43 +121,45 @@
   } u;
 };
 
-struct ospf_path *ospf_path_new ();
-void ospf_path_free (struct ospf_path *);
-struct ospf_path *ospf_path_lookup (struct list *, struct ospf_path *);
-struct ospf_route *ospf_route_new ();
-void ospf_route_free (struct ospf_route *);
-void ospf_route_delete (struct route_table *);
-void ospf_route_table_free (struct route_table *);
+extern struct ospf_path *ospf_path_new (void);
+extern void ospf_path_free (struct ospf_path *);
+extern struct ospf_path *ospf_path_lookup (struct list *, struct ospf_path *);
+extern struct ospf_route *ospf_route_new (void);
+extern void ospf_route_free (struct ospf_route *);
+extern void ospf_route_delete (struct route_table *);
+extern void ospf_route_table_free (struct route_table *);
 
-void ospf_route_install (struct ospf *, struct route_table *);
-void ospf_route_table_dump (struct route_table *);
+extern void ospf_route_install (struct ospf *, struct route_table *);
+extern void ospf_route_table_dump (struct route_table *);
 
-void ospf_intra_add_router (struct route_table *, struct vertex *,
-			    struct ospf_area *);
+extern void ospf_intra_add_router (struct route_table *, struct vertex *,
+				   struct ospf_area *);
 
-void ospf_intra_add_transit (struct route_table *, struct vertex *,
-			     struct ospf_area *);
+extern void ospf_intra_add_transit (struct route_table *, struct vertex *,
+				    struct ospf_area *);
 
-void ospf_intra_add_stub (struct route_table *, struct router_lsa_link *,
- 		          struct vertex *, struct ospf_area *);
+extern void ospf_intra_add_stub (struct route_table *,
+				 struct router_lsa_link *, struct vertex *,
+				 struct ospf_area *);
 
-int ospf_route_cmp (struct ospf *, struct ospf_route *, struct ospf_route *);
-void ospf_route_copy_nexthops (struct ospf_route *, struct list *);
-void ospf_route_copy_nexthops_from_vertex (struct ospf_route *,
-					   struct vertex * );
-
-void ospf_route_subst (struct route_node *, struct ospf_route *,
-		       struct ospf_route *);
-void ospf_route_add (struct route_table *, struct prefix_ipv4 *,
-		     struct ospf_route *, struct ospf_route *);
-
-void ospf_route_subst_nexthops (struct ospf_route *, struct list *);
-void ospf_prune_unreachable_networks (struct route_table *);
-void ospf_prune_unreachable_routers (struct route_table *);
-int ospf_add_discard_route (struct route_table *, struct ospf_area *, 
-			    struct prefix_ipv4 *);
-void ospf_delete_discard_route (struct prefix_ipv4 *);
-int ospf_route_match_same (struct route_table *, struct prefix_ipv4 *,
+extern int ospf_route_cmp (struct ospf *, struct ospf_route *,
 			   struct ospf_route *);
+extern void ospf_route_copy_nexthops (struct ospf_route *, struct list *);
+extern void ospf_route_copy_nexthops_from_vertex (struct ospf_route *,
+						  struct vertex *);
+
+extern void ospf_route_subst (struct route_node *, struct ospf_route *,
+			      struct ospf_route *);
+extern void ospf_route_add (struct route_table *, struct prefix_ipv4 *,
+			    struct ospf_route *, struct ospf_route *);
+
+extern void ospf_route_subst_nexthops (struct ospf_route *, struct list *);
+extern void ospf_prune_unreachable_networks (struct route_table *);
+extern void ospf_prune_unreachable_routers (struct route_table *);
+extern int ospf_add_discard_route (struct route_table *, struct ospf_area *,
+				   struct prefix_ipv4 *);
+extern void ospf_delete_discard_route (struct prefix_ipv4 *);
+extern int ospf_route_match_same (struct route_table *, struct prefix_ipv4 *,
+				  struct ospf_route *);
 
 #endif /* _ZEBRA_OSPF_ROUTE_H */