diff --git a/extmod/mpbthci.h b/extmod/mpbthci.h
index acb5b832ba..6997238033 100644
--- a/extmod/mpbthci.h
+++ b/extmod/mpbthci.h
@@ -45,6 +45,7 @@ int mp_bluetooth_hci_controller_wakeup(void);
 int mp_bluetooth_hci_uart_init(uint32_t port, uint32_t baudrate);
 int mp_bluetooth_hci_uart_deinit(void);
 int mp_bluetooth_hci_uart_set_baudrate(uint32_t baudrate);
+int mp_bluetooth_hci_uart_any(void);
 int mp_bluetooth_hci_uart_readchar(void);
 int mp_bluetooth_hci_uart_write(const uint8_t *buf, size_t len);