diff --git a/platform.h b/platform.h
index 31d9623..3a56197 100644
--- a/platform.h
+++ b/platform.h
@@ -53,10 +53,9 @@
 #  include <math.h>
 #  define PICOC_MATH_LIBRARY
 #  define NEED_MATH_LIBRARY
+#  undef BIG_ENDIAN
 #  if defined(__powerpc__) || defined(__hppa__)
 #   define BIG_ENDIAN
-#  else
-#   undef BIG_ENDIAN
 #  endif
 # endif