diff --git a/vl.c b/vl.c
index 18f957d..7db2881 100644
--- a/vl.c
+++ b/vl.c
@@ -2078,6 +2078,7 @@
                 {
                     const char *p;
                     int fd;
+                    net_if_type = NET_IF_TUN;
                     if (nb_tun_fds < MAX_NICS) {
                         fd = strtol(optarg, (char **)&p, 0);
                         if (*p != '\0') {