diff --git a/src/core/lwip/tcp_in.c b/src/core/lwip/tcp_in.c
index 427fa5ebe..4847cd5e3 100644
--- a/src/core/lwip/tcp_in.c
+++ b/src/core/lwip/tcp_in.c
@@ -313,8 +313,10 @@ static void tcp_listen_input(struct tcp_pcb *pcb, tcp_in_data *in_data)
     if (in_data->flags & TCP_ACK) {
         /* For incoming segments with the ACK flag set, respond with a RST. */
         LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_listen_input: ACK in LISTEN, sending reset\n"));
+#if 0
         tcp_rst(in_data->ackno + 1, in_data->seqno + in_data->tcplen, in_data->tcphdr->dest,
                 in_data->tcphdr->src, NULL);
+#endif
     } else if (in_data->flags & TCP_SYN) {
         LWIP_DEBUGF(TCP_DEBUG,
                     ("TCP connection request %" U16_F " -> %" U16_F ".\n", in_data->tcphdr->src,