diff --git a/net/netdev/netdev_ifconf.c b/net/netdev/netdev_ifconf.c
index 282df17b322..024254f20bc 100644
--- a/net/netdev/netdev_ifconf.c
+++ b/net/netdev/netdev_ifconf.c
@@ -177,6 +177,7 @@ static int ifconf_ipv6_addr_callback(FAR struct net_driver_s *dev,
         (FAR struct sockaddr_in6 *)&req->lifr_addr;
 #ifdef CONFIG_NETDEV_MULTIPLE_IPv6
       int addr_idx = addr - dev->d_ipv6;
+      char ifname[IFNAMSIZ + 16];
 
       /* There is space for information about another adapter.  Within
        * each ifreq structure, lifr_name will receive the interface
@@ -188,12 +189,14 @@ static int ifconf_ipv6_addr_callback(FAR struct net_driver_s *dev,
         {
           /* eth0:0 represents the second addr on eth0 */
 
-          if (snprintf(req->lifr_name, IFNAMSIZ,
+          if (snprintf(ifname, sizeof(ifname),
                        "%s:%d", dev->d_ifname, addr_idx - 1) >= IFNAMSIZ)
             {
               nwarn("WARNING: ifname too long to print %s:%d\n",
                     dev->d_ifname, addr_idx - 1);
             }
+
+          strlcpy(req->lifr_name, ifname, IFNAMSIZ);
         }
       else
 #endif