diff --git a/libs/exasock/tcp.h b/libs/exasock/tcp.h
index 3b53239..c9bf97d 100644
--- a/libs/exasock/tcp.h
+++ b/libs/exasock/tcp.h
@@ -478,7 +478,7 @@ exa_tcp_build_ctrl(struct exa_tcp_conn * restrict ctx, char ** restrict hdr,
 
     case EXA_TCP_FIN_WAIT_2:
         /* Send ACK */
-        h->th_seq = htonl(state->send_seq);
+        h->th_seq = htonl(state->send_seq + 1);
         h->th_ack = htonl(recv_seq);
         h->th_flags = TH_ACK;
         PROFILE_INFO_TCP_TX_RX_EVENT(false, ctx, EXA_TCP_FIN_WAIT_2, 0, 1, state->send_seq, recv_seq);
diff --git a/modules/exasock/exasock-tcp.c b/modules/exasock/exasock-tcp.c
index 18775e0..6872058 100644
--- a/modules/exasock/exasock-tcp.c
+++ b/modules/exasock/exasock-tcp.c
@@ -3817,7 +3817,8 @@ static void exasock_tcp_send_ack(struct exasock_tcp *tcp, bool dup)
         struct exa_socket_state *state = tcp->user_page;
         uint32_t seq = state->p.tcp.send_seq;
         if (state->p.tcp.state == EXA_TCP_TIME_WAIT ||
-            state->p.tcp.state == EXA_TCP_CLOSING)
+            state->p.tcp.state == EXA_TCP_CLOSING ||
+            state->p.tcp.state == EXA_TCP_FIN_WAIT_2)
         {
             seq++;
         }