diff --git a/src/vnet/ipsec/ipsec_api.c b/src/vnet/ipsec/ipsec_api.c
index f233364..3f30a7d 100644
--- a/src/vnet/ipsec/ipsec_api.c
+++ b/src/vnet/ipsec/ipsec_api.c
@@ -470,6 +470,7 @@
   tun.integ_alg = mp->integ_alg;
   tun.local_integ_key_len = mp->local_integ_key_len;
   tun.remote_integ_key_len = mp->remote_integ_key_len;
+  tun.udp_encap = mp->udp_encap;
   memcpy (&tun.local_ip, mp->local_ip, 4);
   memcpy (&tun.remote_ip, mp->remote_ip, 4);
   memcpy (&tun.local_crypto_key, &mp->local_crypto_key,