diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index aa2543b3c286..46e20444ba19 100644
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c
@@ -368,6 +368,7 @@ void hci_uart_unregister_device(struct hci_uart *hu)
 {
 	struct hci_dev *hdev = hu->hdev;
 
+	clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 	hci_unregister_dev(hdev);
 	hci_free_dev(hdev);