diff --git a/zebra/rtadv.c b/zebra/rtadv.c
index f3f1cee14b..93f0155fdb 100644
--- a/zebra/rtadv.c
+++ b/zebra/rtadv.c
@@ -619,7 +619,7 @@ rtadv_read (struct thread *thread)
   /* Register myself. */
   rtadv_event (zns, RTADV_READ, sock);
 
-  len = rtadv_recv_packet (zns, sock, buf, BUFSIZ, &from, &ifindex, &hoplimit);
+  len = rtadv_recv_packet (zns, sock, buf, sizeof (buf), &from, &ifindex, &hoplimit);
 
   if (len < 0) 
     {