diff --git a/ospfd/ospf_dump.h b/ospfd/ospf_dump.h
index 50e61e6..81abb75 100644
--- a/ospfd/ospf_dump.h
+++ b/ospfd/ospf_dump.h
@@ -125,15 +125,15 @@
 extern char *ospf_lsa_type_str[];
 
 /* Prototypes. */
-const char *ospf_area_name_string (struct ospf_area *);
-const char *ospf_area_desc_string (struct ospf_area *);
-const char *ospf_if_name_string (struct ospf_interface *);
-void ospf_nbr_state_message (struct ospf_neighbor *, char *, size_t);
-char *ospf_options_dump (u_char);
-const char *ospf_timer_dump (struct thread *, char *, size_t);
-void ospf_ip_header_dump (struct ip *);
-void ospf_packet_dump (struct stream *);
-void ospf_lsa_header_dump (struct lsa_header *);
-void debug_init ();
+extern const char *ospf_area_name_string (struct ospf_area *);
+extern const char *ospf_area_desc_string (struct ospf_area *);
+extern const char *ospf_if_name_string (struct ospf_interface *);
+extern void ospf_nbr_state_message (struct ospf_neighbor *, char *, size_t);
+extern char *ospf_options_dump (u_char);
+extern const char *ospf_timer_dump (struct thread *, char *, size_t);
+extern void ospf_ip_header_dump (struct ip *);
+extern void ospf_packet_dump (struct stream *);
+extern void ospf_lsa_header_dump (struct lsa_header *);
+extern void debug_init (void);
 
 #endif /* _ZEBRA_OSPF_DUMP_H */