diff --git a/bgpd/bgp_vty.h b/bgpd/bgp_vty.h
index 5256728..d3b4e2b 100644
--- a/bgpd/bgp_vty.h
+++ b/bgpd/bgp_vty.h
@@ -21,7 +21,7 @@
 #ifndef _QUAGGA_BGP_VTY_H
 #define _QUAGGA_BGP_VTY_H
 
-void bgp_vty_init ();
-char *afi_safi_print (afi_t, safi_t);
+extern void bgp_vty_init (void);
+extern const char *afi_safi_print (afi_t, safi_t);
 
 #endif /* _QUAGGA_BGP_VTY_H */