diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index f76a8e044e4ef3b10e121b56de32726b3856926a..75f312ed96e8493cd986e89386d12d671f526128 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -115,6 +115,8 @@ static int ttyport_open(struct serdev_controller *ctrl)
 	ktermios.c_cflag &= ~(CSIZE | PARENB);
 	ktermios.c_cflag |= CS8;
 	ktermios.c_cflag |= CRTSCTS;
+	/* Hangups are not supported so make sure to ignore carrier detect. */
+	ktermios.c_cflag |= CLOCAL;
 	tty_set_termios(tty, &ktermios);
 
 	set_bit(SERPORT_ACTIVE, &serport->flags);