diff --git a/lib/libexpat/expat_config.h b/lib/libexpat/expat_config.h
index 036c4d3a5cd5..980812954a82 100644
--- a/lib/libexpat/expat_config.h
+++ b/lib/libexpat/expat_config.h
@@ -1,7 +1,13 @@
 /* $FreeBSD$ */
 
+#include <machine/endian.h>
+
 /* 1234 = LIL_ENDIAN, 4321 = BIGENDIAN */
+#if BYTE_ORDER == LITTLE_ENDIAN
 #define BYTEORDER 1234
+#else
+#define BYTEORDER 4321
+#endif
 
 /* Define to 1 if you have the `bcopy' function. */
 #define HAVE_BCOPY 1
@@ -67,7 +73,11 @@
 #define STDC_HEADERS 1
 
 /* whether byteorder is bigendian */
-/* #undef WORDS_BIGENDIAN */
+#if BYTE_ORDER == BIG_ENDIAN
+#define WORDS_BIGENDIAN
+#else
+#undef WORDS_BIGENDIAN 
+#endif
 
 /* Define to specify how much context to retain around the current parse
    point. */