diff --git a/ripd/rip_zebra.c b/ripd/rip_zebra.c
index 0b6c22a..1411cd7 100644
--- a/ripd/rip_zebra.c
+++ b/ripd/rip_zebra.c
@@ -148,7 +148,7 @@
   /* IPv4 prefix. */
   memset (&p, 0, sizeof (struct prefix_ipv4));
   p.family = AF_INET;
-  p.prefixlen = stream_getc (s);
+  p.prefixlen = MIN(IPV4_MAX_PREFIXLEN, stream_getc (s));
   stream_get (&p.prefix, s, PSIZE (p.prefixlen));
 
   /* Nexthop, ifindex, distance, metric. */