diff --git a/sys/net/gnrc/network_layer/sixlowpan/nd/gnrc_sixlowpan_nd.c b/sys/net/gnrc/network_layer/sixlowpan/nd/gnrc_sixlowpan_nd.c
index ae05fc8056..ae8cbd3e08 100644
--- a/sys/net/gnrc/network_layer/sixlowpan/nd/gnrc_sixlowpan_nd.c
+++ b/sys/net/gnrc/network_layer/sixlowpan/nd/gnrc_sixlowpan_nd.c
@@ -63,6 +63,7 @@ void gnrc_sixlowpan_nd_router_set_rtr_adv(gnrc_ipv6_netif_t *netif, bool enable)
     if (enable && (gnrc_ipv6_netif_add_addr(netif->pid, &all_routers, 128,
                                             GNRC_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST) != NULL)) {
         netif->flags |= GNRC_IPV6_NETIF_FLAGS_RTR_ADV;
+        netif->adv_ltime = GNRC_IPV6_NETIF_DEFAULT_ROUTER_LTIME;
     }
     else {
         netif->flags &= ~GNRC_IPV6_NETIF_FLAGS_RTR_ADV;