diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index b40f7b90c81da53925c420f7d8e37a18a739d4dd..b4129f53fb1b1c7a6fe5d18e7fd2ed8097fcdfda 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -3318,6 +3318,7 @@ void serial8250_unregister_port(int line)
 		uart->port.flags &= ~UPF_BOOT_AUTOCONF;
 		uart->port.type = PORT_UNKNOWN;
 		uart->port.dev = &serial8250_isa_devs->dev;
+		uart->capabilities = uart_config[uart->port.type].flags;
 		uart_add_one_port(&serial8250_reg, &uart->port);
 	} else {
 		uart->port.dev = NULL;