diff --git a/lrzip_private.h b/lrzip_private.h
index 4a79918..fa29f44 100644
--- a/lrzip_private.h
+++ b/lrzip_private.h
@@ -67,6 +67,10 @@ void *alloca (size_t);
 # include <sys/endian.h>
 #endif
 #ifndef __BYTE_ORDER
+# ifndef __BIG_ENDIAN
+#  define __BIG_ENDIAN	4321
+#  define __LITTLE_ENDIAN	1234
+# endif
 # ifdef WORDS_BIGENDIAN
 #  define __BYTE_ORDER __BIG_ENDIAN
 # else
diff --git a/rzip.c b/rzip.c
index 38d7fc7..0320515 100644
--- a/rzip.c
+++ b/rzip.c
@@ -772,7 +772,7 @@ static inline void init_hash_indexes(struct rzip_state *st)
 		st->hash_index[i] = ((random() << 16) ^ random());
 }
 
-#if defined(__APPLE__) || defined(__FreeBSD__)
+#if !defined(__linux)
 # define mremap fake_mremap
 
 static inline void *fake_mremap(void *old_address, size_t old_size, size_t new_size, int flags __UNUSED__)