diff --git a/ospfd/ospf_zebra.h b/ospfd/ospf_zebra.h
index e8ad979..7fe87b7 100644
--- a/ospfd/ospf_zebra.h
+++ b/ospfd/ospf_zebra.h
@@ -40,37 +40,39 @@
 };
 
 /* Prototypes */
-void ospf_zclient_start ();
+extern void ospf_zclient_start (void);
 
-void ospf_zebra_add (struct prefix_ipv4 *, struct ospf_route *);
-void ospf_zebra_delete (struct prefix_ipv4 *, struct ospf_route *);
+extern void ospf_zebra_add (struct prefix_ipv4 *, struct ospf_route *);
+extern void ospf_zebra_delete (struct prefix_ipv4 *, struct ospf_route *);
 
-void ospf_zebra_add_discard (struct prefix_ipv4 *);
-void ospf_zebra_delete_discard (struct prefix_ipv4 *);
+extern void ospf_zebra_add_discard (struct prefix_ipv4 *);
+extern void ospf_zebra_delete_discard (struct prefix_ipv4 *);
 
-int ospf_default_originate_timer (struct thread *);
+extern int ospf_default_originate_timer (struct thread *);
 
-int ospf_redistribute_check (struct ospf *, struct external_info *, int *);
-int ospf_distribute_check_connected (struct ospf *, struct external_info *);
-void ospf_distribute_list_update (struct ospf *, int);
+extern int ospf_redistribute_check (struct ospf *, struct external_info *,
+				    int *);
+extern int ospf_distribute_check_connected (struct ospf *,
+					    struct external_info *);
+extern void ospf_distribute_list_update (struct ospf *, int);
 
-int ospf_is_type_redistributed (int);
-void ospf_distance_reset (struct ospf *);
-u_char ospf_distance_apply (struct prefix_ipv4 *, struct ospf_route *);
+extern int ospf_is_type_redistributed (int);
+extern void ospf_distance_reset (struct ospf *);
+extern u_char ospf_distance_apply (struct prefix_ipv4 *, struct ospf_route *);
 
-struct vty;
-
-int ospf_redistribute_set (struct ospf *, int, int, int);
-int ospf_redistribute_unset (struct ospf *, int);
-int ospf_redistribute_default_set (struct ospf *, int, int, int);
-int ospf_redistribute_default_unset (struct ospf *);
-int ospf_distribute_list_out_set (struct ospf *, int, const char *);
-int ospf_distribute_list_out_unset (struct ospf *, int, const char *);
-void ospf_routemap_set (struct ospf *, int, const char *);
-void ospf_routemap_unset (struct ospf *, int);
-int ospf_distance_set (struct vty *, struct ospf *, const char *, const char *, const char *);
-int ospf_distance_unset (struct vty *, struct ospf *, const char *, const char *, const char *);
-void ospf_zebra_init ();
+extern int ospf_redistribute_set (struct ospf *, int, int, int);
+extern int ospf_redistribute_unset (struct ospf *, int);
+extern int ospf_redistribute_default_set (struct ospf *, int, int, int);
+extern int ospf_redistribute_default_unset (struct ospf *);
+extern int ospf_distribute_list_out_set (struct ospf *, int, const char *);
+extern int ospf_distribute_list_out_unset (struct ospf *, int, const char *);
+extern void ospf_routemap_set (struct ospf *, int, const char *);
+extern void ospf_routemap_unset (struct ospf *, int);
+extern int ospf_distance_set (struct vty *, struct ospf *, const char *,
+			      const char *, const char *);
+extern int ospf_distance_unset (struct vty *, struct ospf *, const char *,
+				const char *, const char *);
+extern void ospf_zebra_init (void);
 
 #endif /* _ZEBRA_OSPF_ZEBRA_H */