diff --git a/sys/powerpc/include/endian.h b/sys/powerpc/include/endian.h
--- a/sys/powerpc/include/endian.h
+++ b/sys/powerpc/include/endian.h
@@ -36,18 +36,6 @@
 #define	_MACHINE_ENDIAN_H_
 
 #include <sys/_types.h>
-
-/*
- * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__
- * and __LITTLE_ENDIAN__ (resp).
- */
-#ifdef _BIG_ENDIAN
-#undef _BIG_ENDIAN
-#endif
-#ifdef _LITTLE_ENDIAN
-#undef _LITTLE_ENDIAN
-#endif
-
 #include <sys/_endian.h>
 
 #endif /* !_MACHINE_ENDIAN_H_ */