diff --git a/setter/defs.h b/setter/defs.h
index 124de10..adb1cdc 100644
--- a/setter/defs.h
+++ b/setter/defs.h
@@ -32,6 +32,8 @@ Copyright (C) 2011-2018 Natalia Portillo
 #ifndef DIC_FSTESTER_SETTER_DEFS_H
 #define DIC_FSTESTER_SETTER_DEFS_H
 
+#include <stddef.h>
+
 void GetOsInfo();
 
 void GetVolumeInfo(const char *path, size_t *clusterSize);
diff --git a/setter/main.c b/setter/main.c
index 295bfba..e76a915 100644
--- a/setter/main.c
+++ b/setter/main.c
@@ -29,10 +29,11 @@ Contains global definitions
 Copyright (C) 2011-2018 Natalia Portillo
 *****************************************************************************/
 
-#include "main.h"
 
+#include "main.h"
 #include "defs.h"
 
+#include <stddef.h>
 #include <stdio.h>
 
 #if defined(macintosh)