diff --git a/ports/nrf/drivers/bluetooth/ble_uart.c b/ports/nrf/drivers/bluetooth/ble_uart.c
index 0e0e147c2..f10e6d4d7 100644
--- a/ports/nrf/drivers/bluetooth/ble_uart.c
+++ b/ports/nrf/drivers/bluetooth/ble_uart.c
@@ -31,6 +31,7 @@
 #include "ringbuffer.h"
 #include "mphalport.h"
 #include "lib/utils/interrupt_char.h"
+#include "py/runtime.h"
 #include "wdt.h"
 
 #if MICROPY_PY_BLE_NUS
@@ -93,15 +94,21 @@ static ubluepy_advertise_data_t m_adv_data_uart_service;
 static ubluepy_advertise_data_t m_adv_data_eddystone_url;
 #endif // BLUETOOTH_WEBBLUETOOTH_REPL
 
+static void relax(void) {
+    mp_handle_pending();
+    wdt_feed(false);
+    __WFI();
+}
+
 int mp_hal_stdin_rx_chr(void) {
     wdt_feed(false);
 
     while (!ble_uart_enabled()) {
         // wait for connection
-	wdt_feed(false);
+	relax();
     }
     while (isBufferEmpty(mp_rx_ring_buffer)) {
-	wdt_feed(false);
+	relax();
     }
 
     uint8_t byte;