diff --git a/ports/stm32/mpmetalport.h b/ports/stm32/mpmetalport.h
index 53f329d15..706249b6a 100644
--- a/ports/stm32/mpmetalport.h
+++ b/ports/stm32/mpmetalport.h
@@ -70,7 +70,8 @@ static inline int __metal_sleep_usec(unsigned int usec) {
 }
 
 static inline void metal_generic_default_poll(void) {
-    MICROPY_EVENT_POLL_HOOK
+    mp_event_handle_nowait();
+    __WFI();
 }
 
 #endif // MICROPY_INCLUDED_STM32_METAL_PORT_H