diff --git a/ospfd/ospf_packet.h b/ospfd/ospf_packet.h
index af9e634..7b3d686 100644
--- a/ospfd/ospf_packet.h
+++ b/ospfd/ospf_packet.h
@@ -131,36 +131,37 @@
 #define IS_SET_DD_ALL(X)        ((X) & OSPF_DD_FLAG_ALL)
 
 /* Prototypes. */
-void ospf_output_forward (struct stream *, int);
-struct ospf_packet *ospf_packet_new (size_t);
-void ospf_packet_free (struct ospf_packet *);
-struct ospf_fifo *ospf_fifo_new ();
-void ospf_fifo_push (struct ospf_fifo *, struct ospf_packet *);
-struct ospf_packet *ospf_fifo_pop (struct ospf_fifo *);
-struct ospf_packet *ospf_fifo_head (struct ospf_fifo *);
-void ospf_fifo_flush (struct ospf_fifo *);
-void ospf_fifo_free (struct ospf_fifo *);
-void ospf_packet_add (struct ospf_interface *, struct ospf_packet *);
-void ospf_packet_delete (struct ospf_interface *);
-struct stream *ospf_stream_dup (struct stream *);
-struct ospf_packet *ospf_packet_dup (struct ospf_packet *);
+extern void ospf_output_forward (struct stream *, int);
+extern struct ospf_packet *ospf_packet_new (size_t);
+extern void ospf_packet_free (struct ospf_packet *);
+extern struct ospf_fifo *ospf_fifo_new (void);
+extern void ospf_fifo_push (struct ospf_fifo *, struct ospf_packet *);
+extern struct ospf_packet *ospf_fifo_pop (struct ospf_fifo *);
+extern struct ospf_packet *ospf_fifo_head (struct ospf_fifo *);
+extern void ospf_fifo_flush (struct ospf_fifo *);
+extern void ospf_fifo_free (struct ospf_fifo *);
+extern void ospf_packet_add (struct ospf_interface *, struct ospf_packet *);
+extern void ospf_packet_delete (struct ospf_interface *);
+extern struct stream *ospf_stream_dup (struct stream *);
+extern struct ospf_packet *ospf_packet_dup (struct ospf_packet *);
 
-int ospf_read (struct thread *);
-void ospf_hello_send (struct ospf_interface *);
-void ospf_db_desc_send (struct ospf_neighbor *);
-void ospf_db_desc_resend (struct ospf_neighbor *);
-void ospf_ls_req_send (struct ospf_neighbor *);
-void ospf_ls_upd_send_lsa (struct ospf_neighbor *, struct ospf_lsa *, int);
-void ospf_ls_upd_send (struct ospf_neighbor *, struct list *, int);
-void ospf_ls_ack_send (struct ospf_neighbor *, struct ospf_lsa *);
-void ospf_ls_ack_send_delayed (struct ospf_interface *);
-void ospf_ls_retransmit (struct ospf_interface *, struct ospf_lsa *);
-void ospf_ls_req_event (struct ospf_neighbor *);
+extern int ospf_read (struct thread *);
+extern void ospf_hello_send (struct ospf_interface *);
+extern void ospf_db_desc_send (struct ospf_neighbor *);
+extern void ospf_db_desc_resend (struct ospf_neighbor *);
+extern void ospf_ls_req_send (struct ospf_neighbor *);
+extern void ospf_ls_upd_send_lsa (struct ospf_neighbor *, struct ospf_lsa *,
+				  int);
+extern void ospf_ls_upd_send (struct ospf_neighbor *, struct list *, int);
+extern void ospf_ls_ack_send (struct ospf_neighbor *, struct ospf_lsa *);
+extern void ospf_ls_ack_send_delayed (struct ospf_interface *);
+extern void ospf_ls_retransmit (struct ospf_interface *, struct ospf_lsa *);
+extern void ospf_ls_req_event (struct ospf_neighbor *);
 
-int ospf_ls_upd_timer (struct thread *);
-int ospf_ls_ack_timer (struct thread *);
-int ospf_poll_timer (struct thread *);
-int ospf_hello_reply_timer (struct thread *);
-void ospf_hello_send_sub (struct ospf_interface *, struct in_addr *);
+extern int ospf_ls_upd_timer (struct thread *);
+extern int ospf_ls_ack_timer (struct thread *);
+extern int ospf_poll_timer (struct thread *);
+extern int ospf_hello_reply_timer (struct thread *);
+extern void ospf_hello_send_sub (struct ospf_interface *, struct in_addr *);
 
 #endif /* _ZEBRA_OSPF_PACKET_H */