diff --git a/software/include/base/stddef.h b/software/include/base/stddef.h
new file mode 100644
index 000000000..331f39e7c
--- /dev/null
+++ b/software/include/base/stddef.h
@@ -0,0 +1,11 @@
+#ifndef __STDDEF_H
+#define __STDDEF_H
+
+#define NULL ((void *)0)
+
+typedef unsigned long size_t;
+typedef long ptrdiff_t;
+
+#define offsetof(s,m) (size_t)&(((s *)0)->m)
+
+#endif /* __STDDEF_H */
diff --git a/software/include/base/stdlib.h b/software/include/base/stdlib.h
index cea677d50..7d2e25088 100644
--- a/software/include/base/stdlib.h
+++ b/software/include/base/stdlib.h
@@ -19,6 +19,8 @@
 #ifndef __STDLIB_H
 #define __STDLIB_H
 
+#include <stddef.h>
+
 #define PRINTF_ZEROPAD	1		/* pad with zero */
 #define PRINTF_SIGN	2		/* unsigned/signed long */
 #define PRINTF_PLUS	4		/* show plus */
@@ -27,11 +29,6 @@
 #define PRINTF_SPECIAL	32		/* 0x */
 #define PRINTF_LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */
 
-typedef unsigned long size_t;
-typedef long ptrdiff_t;
-
-#define NULL ((void *)0)
-
 #define likely(x) x
 #define unlikely(x) x