diff --git a/0096-tcp_send_fin-add-the-fin-to-the-last-unsent-segment.patch b/0096-tcp_send_fin-add-the-fin-to-the-last-unsent-segment.patch
new file mode 100644
index 0000000..2e77f0e
--- /dev/null
+++ b/0096-tcp_send_fin-add-the-fin-to-the-last-unsent-segment.patch
@@ -0,0 +1,27 @@
+From c91f1d05c65526fe250cf5e5c32f9038721bc1d5 Mon Sep 17 00:00:00 2001
+From: yangchen <yangchen145@huawei.com>
+Date: Mon, 25 Dec 2023 12:39:56 +0800
+Subject: [PATCH] tcp_send_fin: add the fin to the last unsent segment
+
+---
+ src/core/tcp_out.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
+index 137e3cf..e5c407e 100644
+--- a/src/core/tcp_out.c
++++ b/src/core/tcp_out.c
+@@ -1195,8 +1195,8 @@ tcp_send_fin(struct tcp_pcb *pcb)
+   LWIP_ASSERT("tcp_send_fin: invalid pcb", pcb != NULL);
+ 
+   /* first, try to add the fin to the last unsent segment */
+-  if (pcb->unsent != NULL) {
+-    struct tcp_seg *last_unsent = pcb->unsent;
++  if (pcb->last_unsent != NULL) {
++    struct tcp_seg *last_unsent = pcb->last_unsent;
+ 
+     if ((TCPH_FLAGS(last_unsent->tcphdr) & (TCP_SYN | TCP_FIN | TCP_RST)) == 0) {
+       /* no SYN/FIN/RST flag in the header, we can add the FIN flag */
+-- 
+2.33.0
+
diff --git a/lwip.spec b/lwip.spec
index ae56f29..6bc6e06 100644
--- a/lwip.spec
+++ b/lwip.spec
@@ -4,7 +4,7 @@
 Summary: lwip is a small independent implementation of the TCP/IP protocol suite
 Name:    lwip
 Version: 2.1.3
-Release: 98
+Release: 99
 License: BSD
 URL:     http://savannah.nongnu.org/projects/lwip/
 Source0: http://download.savannah.nongnu.org/releases/lwip/%{name}-%{version}.zip
@@ -109,6 +109,7 @@ Patch9091:  0092-fix-the-coredump-issue-when-UDP-traffic-is-sent.patch
 Patch9092:  0093-modfiy-accept-null-pointer-when-new-conn-receive-RST-packet-in-listening.patch
 Patch9093:  0094-lwip-log-fix-reversed-port-in-tcp_input.patch
 Patch9094:  0095-event_callback-del-errevent-log-if-err-is-ERR_OK.patch
+Patch9095:  0096-tcp_send_fin-add-the-fin-to-the-last-unsent-segment.patch
 
 BuildRequires: gcc-c++ dos2unix dpdk-devel
 
@@ -139,6 +140,9 @@ cd %{_builddir}/%{name}-%{version}/src
 %{_libdir}/liblwip.a
 
 %changelog
+* Sat Dec 23 2023 yangchen <yangchen145@huawei.com> - 2.1.3-99
+- tcp_send_fin: add the fin to the last unsent segment
+
 * Wed Dec 20 2023 yangchen <yangchen145@huawei.com> - 2.1.3-98
 - event_callback: del errevent log if err is ERR_OK