diff --git a/newlib/libc/sys/rtems/include/netinet6/in6.h b/newlib/libc/sys/rtems/include/netinet6/in6.h
index 235c9902a..00783e50e 100644
--- a/newlib/libc/sys/rtems/include/netinet6/in6.h
+++ b/newlib/libc/sys/rtems/include/netinet6/in6.h
@@ -643,7 +643,8 @@ struct ip6_mtuinfo {
 #define	IPV6CTL_INTRDQMAXLEN	52	/* max length of direct IPv6 netisr
 					 * queue */
 #define	IPV6CTL_MAXFRAGSPERPACKET	53 /* Max fragments per packet */
-#define	IPV6CTL_MAXID		54
+#define	IPV6CTL_MAXFRAGBUCKETSIZE	54 /* Max reassembly queues per bucket */
+#define	IPV6CTL_MAXID		55
 #endif /* __BSD_VISIBLE */
 
 /*