diff --git a/CHANGELOG b/CHANGELOG
index 02b1b059..ab7e4541 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -24,6 +24,9 @@ HISTORY
 
  ++ Bugfixes:
 
+  2011-09-01: Simon Goldschmidt
+  * tcp_in.c: fixed bug #34111 RST for ACK to listening pcb has wrong seqno
+
   2011-08-24: Simon Goldschmidt
   * api_msg.c, sockets.c: fixed bug #33956 Wrong error returned when calling
     accept() on UDP connections
diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index 90952648..0fe03ab7 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -444,15 +444,19 @@ tcp_listen_input(struct tcp_pcb_listen *pcb)
   struct tcp_pcb *npcb;
   err_t rc;
 
+  if (flags & TCP_RST) {
+    /* An incoming RST should be ignored. Return. */
+    return ERR_OK;
+  }
+
   /* In the LISTEN state, we check for incoming SYN segments,
      creates a new PCB, and responds with a SYN|ACK. */
   if (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"));
-    tcp_rst(ackno + 1, seqno + tcplen,
-      ip_current_dest_addr(), ip_current_src_addr(),
-      tcphdr->dest, tcphdr->src);
+    tcp_rst(ackno, seqno + tcplen, ip_current_dest_addr(),
+      ip_current_src_addr(), tcphdr->dest, tcphdr->src);
   } else if (flags & TCP_SYN) {
     LWIP_DEBUGF(TCP_DEBUG, ("TCP connection request %"U16_F" -> %"U16_F".\n", tcphdr->src, tcphdr->dest));
 #if TCP_LISTEN_BACKLOG