diff --git a/headers/posix/stddef.h b/headers/posix/stddef.h
index ac24a7aa6d..ce7ec9ca6e 100644
--- a/headers/posix/stddef.h
+++ b/headers/posix/stddef.h
@@ -5,7 +5,11 @@
 */
 #include <null.h>
 
+#if defined(__GNUC__) && __GNUC__ > 3
+#define offsetof(type,member)   __builtin_offsetof(type, member)
+#else
 #define offsetof(type,member) ((size_t)&((type*)0)->member)
+#endif
 
 typedef long ptrdiff_t;