diff --git a/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c b/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
index c48490a27f..aa5acc7f87 100644
--- a/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
+++ b/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
@@ -216,7 +216,7 @@ gnrc_pktsnip_t *gnrc_ndp_opt_ri_build(const ipv6_addr_t *prefix,
         ndp_opt_ri_t *ri_opt = pkt->data;
 
         ri_opt->prefix_len = prefix_len;
-        ri_opt->flags = (flags & NDP_OPT_PI_FLAGS_MASK);
+        ri_opt->flags = (flags & NDP_OPT_RI_FLAGS_MASK);
         ri_opt->route_ltime = byteorder_htonl(route_ltime);
         /* Bits beyond prefix_len MUST be 0 */
         ipv6_addr_set_unspecified(&ri_opt->prefix);
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 6628fb8037..f94fd41d09 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
@@ -310,7 +310,7 @@ static void _configure_subnets(uint8_t subnets, uint8_t start_idx, gnrc_netif_t
 
         /* add route information option with new subnet */
         tmp = gnrc_ndp_opt_ri_build(&new_prefix, new_prefix_len, valid_ltime,
-                                    NDP_OPT_RI_FLAGS_PRF_NONE, ext_opts);
+                                    NDP_OPT_RI_FLAGS_PRF_ZERO, ext_opts);
         if (tmp == NULL) {
             DEBUG("auto_subnets: No space left in packet buffer. Not adding RIO\n");
         } else {
@@ -320,8 +320,7 @@ static void _configure_subnets(uint8_t subnets, uint8_t start_idx, gnrc_netif_t
 
     /* immediately send an RA with RIO */
     if (ext_opts) {
-        gnrc_ndp_rtr_adv_send(upstream, NULL,
-                              &ipv6_addr_all_nodes_link_local, true, ext_opts);
+        gnrc_ndp_rtr_adv_send(upstream, NULL, NULL, true, ext_opts);
     } else {
         DEBUG("auto_subnets: Options empty, not sending RA\n");
     }