diff --git a/src/server.c b/src/server.c
index 715f903..2908b03 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1307,8 +1307,7 @@ static int handle_i(patty_ax25_server *server,
     if (sock->seq_recv == frame->ns) {
         patty_ax25_sock_seq_recv_incr(sock);
     } else {
-        return frame->pf?
-            patty_ax25_sock_send_rej(sock, PATTY_AX25_FRAME_RESPONSE, 0): 0;
+        return patty_ax25_sock_send_rej(sock, PATTY_AX25_FRAME_RESPONSE, 1);
     }
 
     if (write(sock->fd, frame->info, frame->infolen) < 0) {