diff --git a/zebra/rtadv.c b/zebra/rtadv.c
index d4ef1b8..2f62714 100644
--- a/zebra/rtadv.c
+++ b/zebra/rtadv.c
@@ -482,7 +482,7 @@
   /* Register myself. */
   rtadv_event (zvrf, RTADV_READ, sock);
 
-  len = rtadv_recv_packet (sock, buf, BUFSIZ, &from, &ifindex, &hoplimit);
+  len = rtadv_recv_packet (sock, buf, sizeof (buf), &from, &ifindex, &hoplimit);
 
   if (len < 0) 
     {