diff --git a/sysinit.h b/sysinit.h
index ac0f371..1c870c0 100644
--- a/sysinit.h
+++ b/sysinit.h
@@ -53,6 +53,10 @@
 #ifndef _SYSINIT_H_
 #define _SYSINIT_H_ 1
 
+/* for __WEAK */
+#include <cmsis_compiler.h>
+
+#include <stdint.h>
 #include <linker_set.h>
 
 /* from FreeBSD sys/systm.h */