diff --git a/lib_generic/crc32.c b/lib_generic/crc32.c
index 468b3979ab..27335a3ed9 100644
--- a/lib_generic/crc32.c
+++ b/lib_generic/crc32.c
@@ -163,7 +163,7 @@ const uint32_t * ZEXPORT get_crc_table()
 #endif
 
 /* ========================================================================= */
-# ifdef __LITTLE_ENDIAN
+# if __BYTE_ORDER == __LITTLE_ENDIAN
 #  define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8)
 # else
 #  define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)