diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index a81a5c426966c..28133a8e3169b 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1502,7 +1502,7 @@ static void gsm_dlci_t1(unsigned long data)
 			dlci->mode = DLCI_MODE_ADM;
 			gsm_dlci_open(dlci);
 		} else {
-			gsm_dlci_close(dlci);
+			gsm_dlci_begin_close(dlci); /* prevent half open link */
 		}
 
 		break;