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-rw-r--r--src/vnet/tcp/tcp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 4825bf62856..d4b1d77f556 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -837,7 +837,8 @@ tcp_session_open (transport_endpoint_cfg_t * rmt)
/* The other connection vars will be initialized after SYN ACK */
tcp_connection_timers_init (tc);
tc->mss = rmt->mss;
- tc->sw_if_index = rmt->peer.sw_if_index;
+ if (rmt->peer.sw_if_index != ENDPOINT_INVALID_INDEX)
+ tc->sw_if_index = rmt->peer.sw_if_index;
tc->next_node_index = rmt->next_node_index;
tc->next_node_opaque = rmt->next_node_opaque;