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-rw-r--r--runtime/include/stddef.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/runtime/include/stddef.h b/runtime/include/stddef.h
index 5bdff564..452497c3 100644
--- a/runtime/include/stddef.h
+++ b/runtime/include/stddef.h
@@ -114,7 +114,7 @@ typedef signed int wchar_t;
#endif
#if defined(_STDDEF_H) && !defined(offsetof)
-#define offsetof(ty,member) ((size_t) &((ty*) NULL)->member)
+#define offsetof(ty,member) (__builtin_offsetof(ty,member))
#endif
#endif