diff --git a/ports/stm32/usbd_hid_interface.c b/ports/stm32/usbd_hid_interface.c
index 386cf34d7..8dc39f53d 100644
--- a/ports/stm32/usbd_hid_interface.c
+++ b/ports/stm32/usbd_hid_interface.c
@@ -26,6 +26,7 @@
 
 #include "usbd_hid_interface.h"
 
+#include "py/mpstate.h"
 #include "py/mperrno.h"
 #include "py/mphal.h"
 #include "usb.h"