# define GPT_ROOT_NATIVE GPT_ROOT_X86
#endif
-#if defined(__aarch64__) && !defined(WORDS_BIGENDIAN)
+#if defined(__aarch64__) && (__BYTE_ORDER != __BIG_ENDIAN)
# define GPT_ROOT_NATIVE GPT_ROOT_ARM_64
# define GPT_ROOT_SECONDARY GPT_ROOT_ARM
-#elif defined(__arm__) && !defined(WORDS_BIGENDIAN)
+#elif defined(__arm__) && (__BYTE_ORDER != __BIG_ENDIAN)
# define GPT_ROOT_NATIVE GPT_ROOT_ARM
#endif