diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
index 8a81fbca5c9d..6c40bc75fb5b 100644
--- a/drivers/bluetooth/btmtkuart.c
+++ b/drivers/bluetooth/btmtkuart.c
@@ -695,8 +695,7 @@ static int btmtkuart_change_baudrate(struct hci_dev *hdev)
 
 	/* Send a dummy byte 0xff to activate the new baudrate */
 	param = 0xff;
-	err = serdev_device_write(bdev->serdev, &param, sizeof(param),
-				  MAX_SCHEDULE_TIMEOUT);
+	err = serdev_device_write_buf(bdev->serdev, &param, sizeof(param));
 	if (err < 0 || err < sizeof(param))
 		return err;