diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 6b953dfbb15573..1430d7f83bd2ed 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2152,6 +2152,7 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm, bool disc)
 			gsm_dlci_release(gsm->dlci[i]);
 	mutex_unlock(&gsm->mutex);
 	/* Now wipe the queues */
+	tty_ldisc_flush(gsm->tty);
 	list_for_each_entry_safe(txq, ntxq, &gsm->tx_list, list)
 		kfree(txq);
 	INIT_LIST_HEAD(&gsm->tx_list);