diff --git a/src/portmacro.h b/src/portmacro.h
index b2a221a..f3ff239 100644
--- a/src/portmacro.h
+++ b/src/portmacro.h
@@ -6,7 +6,7 @@
 
 #ifndef _PORTMACRO_H_
 #define _PORTMACRO_H_
-#include <Arduino.h>
+#include "stm32_def.h"
 
 #ifndef __CORTEX_M
 #pragma GCC error  "no \"__CORTEX_M\" definition"