diff --git a/extmod/btstack/btstack_hci_uart.c b/extmod/btstack/btstack_hci_uart.c
index 7205dba069..83e865b71d 100644
--- a/extmod/btstack/btstack_hci_uart.c
+++ b/extmod/btstack/btstack_hci_uart.c
@@ -86,6 +86,7 @@ STATIC int btstack_uart_open(void) {
 
 STATIC int btstack_uart_close(void) {
     mp_bluetooth_hci_controller_deinit();
+    mp_bluetooth_hci_uart_deinit();
     return 0;
 }