diff --git a/netutils/netlib/netlib_setarp.c b/netutils/netlib/netlib_setarp.c
index 88dbba81044..1c2261d4cf6 100644
--- a/netutils/netlib/netlib_setarp.c
+++ b/netutils/netlib/netlib_setarp.c
@@ -78,6 +78,7 @@ int netlib_set_arpmapping(FAR const struct sockaddr_in *inaddr,
 
           req.arp_ha.sa_family = ARPHRD_ETHER;
           memcpy(&req.arp_ha.sa_data, macaddr, ETHER_ADDR_LEN);
+          req.arp_flags = ATF_PERM;
           if (ifname != NULL)
             {
                strlcpy((FAR char *)&req.arp_dev, ifname,