diff --git a/include/hal.h b/include/hal.h
index 1585553b..2de7ea73 100644
--- a/include/hal.h
+++ b/include/hal.h
@@ -29,6 +29,7 @@ extern "C" {
 #endif
 
 #include "target.h"
+#include <stdint.h>
 
 /* Architecture specific calls */
 #ifdef MMU