diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index 6ddcaa2de902..60e17d1444c3 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -601,7 +601,6 @@ static void qt2_process_read_urb(struct urb *urb)
 				escapeflag = true;
 				break;
 			case QT2_CONTROL_ESCAPE:
-				tty_buffer_request_room(&port->port, 2);
 				tty_insert_flip_string(&port->port, ch, 2);
 				i += 2;
 				escapeflag = true;
@@ -616,8 +615,7 @@ static void qt2_process_read_urb(struct urb *urb)
 				continue;
 		}
 
-		tty_buffer_request_room(&port->port, 1);
-		tty_insert_flip_string(&port->port, ch, 1);
+		tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
 	}
 
 	tty_flip_buffer_push(&port->port);