diff --git a/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c b/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
index a6797bfd61..fa2226aa87 100644
--- a/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
+++ b/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
@@ -267,7 +267,7 @@ static gnrc_pktsnip_t *_build_final_ext_opts(gnrc_netif_t *netif)
             gnrc_pktsnip_t *snip  = gnrc_ndp_opt_ri_build(&entry->pfx,
                                                           entry->pfx_len,
                                                           valid_ltime,
-                                                          NDP_OPT_RI_FLAGS_PRF_NONE,
+                                                          NDP_OPT_RI_FLAGS_PRF_ZERO,
                                                           ext_opts);
             if (snip != NULL) {
                 ext_opts = snip;
diff --git a/sys/net/gnrc/routing/ipv6_auto_subnets/gnrc_ipv6_auto_subnets.c b/sys/net/gnrc/routing/ipv6_auto_subnets/gnrc_ipv6_auto_subnets.c
index e02a726003..9de3b37ed9 100644
--- a/sys/net/gnrc/routing/ipv6_auto_subnets/gnrc_ipv6_auto_subnets.c
+++ b/sys/net/gnrc/routing/ipv6_auto_subnets/gnrc_ipv6_auto_subnets.c
@@ -1,3 +1,4 @@
+
 /*
  * Copyright (C) 2021 ML!PA Consulting GmbH
  *
@@ -332,7 +333,7 @@ static bool _remove_old_prefix(gnrc_netif_t *netif,
 
     /* invalidate old prefix in RIO */
     tmp = gnrc_ndp_opt_ri_build(&old_pfx, old_pfx_len, 0,
-                                NDP_OPT_RI_FLAGS_PRF_NONE, *ext_opts);
+                                NDP_OPT_RI_FLAGS_PRF_ZERO, *ext_opts);
     if (tmp) {
         *ext_opts = tmp;
     }