diff --git a/bgpd/bgp_fsm.h b/bgpd/bgp_fsm.h
index ce816e2..20fc2d7 100644
--- a/bgpd/bgp_fsm.h
+++ b/bgpd/bgp_fsm.h
@@ -40,4 +40,4 @@
 int bgp_stop (struct peer *peer);
 void bgp_timer_set (struct peer *);
 void bgp_fsm_change_status (struct peer *peer, int status);
-extern char *peer_down_str[];
+extern const char *peer_down_str[];