diff --git a/bgpd/bgp_network.h b/bgpd/bgp_network.h
index b994987..7bcd25a 100644
--- a/bgpd/bgp_network.h
+++ b/bgpd/bgp_network.h
@@ -18,6 +18,11 @@
 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 02111-1307, USA.  */
 
+#ifndef _QUAGGA_BGP_NETWORK_H
+#define _QUAGGA_BGP_NETWORK_H
+
 int bgp_socket (struct bgp *, unsigned short);
 int bgp_connect (struct peer *);
 void bgp_getsockname (struct peer *);
+
+#endif /* _QUAGGA_BGP_NETWORK_H */