diff --git a/ports/stm32/usbd_conf.h b/ports/stm32/usbd_conf.h
index 5fa3c513d6a899e0c9edf3842755b4b5a7b4c340..bf96b7b4947a5d4486bc2fad0fdb858708908e2f 100644
--- a/ports/stm32/usbd_conf.h
+++ b/ports/stm32/usbd_conf.h
@@ -34,6 +34,7 @@
 #define __USBD_CONF_H
 
 /* Includes ------------------------------------------------------------------*/
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>