diff --git a/ospf6d/ospf6_zebra.c b/ospf6d/ospf6_zebra.c
index 30b6fc6..0caf001 100644
--- a/ospf6d/ospf6_zebra.c
+++ b/ospf6d/ospf6_zebra.c
@@ -227,7 +227,7 @@
   /* IPv6 prefix. */
   memset (&p, 0, sizeof (struct prefix_ipv6));
   p.family = AF_INET6;
-  p.prefixlen = stream_getc (s);
+  p.prefixlen = MIN(IPV6_MAX_PREFIXLEN, stream_getc (s));
   stream_get (&p.prefix, s, PSIZE (p.prefixlen));
 
   /* Nexthop, ifindex, distance, metric. */