diff --git a/bgpd/bgp_damp.h b/bgpd/bgp_damp.h
index 09b953e..1aa2508 100644
--- a/bgpd/bgp_damp.h
+++ b/bgpd/bgp_damp.h
@@ -18,6 +18,9 @@
 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 02111-1307, USA.  */
 
+#ifndef _QUAGGA_BGP_DAMP_H
+#define _QUAGGA_BGP_DAMP_H
+
 /* Structure maintained on a per-route basis. */
 struct bgp_damp_info
 {
@@ -140,3 +143,5 @@
 int bgp_config_write_damp (struct vty *);
 void bgp_damp_info_vty (struct vty *, struct bgp_info *);
 char * bgp_damp_reuse_time_vty (struct vty *, struct bgp_info *);
+
+#endif /* _QUAGGA_BGP_DAMP_H */