diff --git a/bgpd/bgp_packet.h b/bgpd/bgp_packet.h
index 7bbcdb2..d9afd5c 100644
--- a/bgpd/bgp_packet.h
+++ b/bgpd/bgp_packet.h
@@ -18,10 +18,10 @@
 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 02111-1307, USA.  */
 
-#define BGP_NLRI_LENGTH       1
-#define BGP_TOTAL_ATTR_LEN    2
-#define BGP_UNFEASIBLE_LEN    2
-#define BGP_WRITE_PACKET_MAX 10
+#define BGP_NLRI_LENGTH       1U
+#define BGP_TOTAL_ATTR_LEN    2U
+#define BGP_UNFEASIBLE_LEN    2U
+#define BGP_WRITE_PACKET_MAX 10U
 
 /* When to refresh */
 #define REFRESH_IMMEDIATE 1