diff --git a/lib/crc32.c b/lib/crc32.c
index c42e7d6..4193f0f 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -611,7 +611,7 @@ static const uint32_t crc32_lookup[16][256] =
     }
 };
 
-#ifndef LITTLE_ENDIAN
+#if BYTE_ORDER != LITTLE_ENDIAN
 /* swap endianness */
 static uint32_t swap(uint32_t x)
 {
@@ -634,7 +634,7 @@ static uint32_t crc32_slice8(uint32_t prev, const void *data, size_t length)
 
     /* process eight bytes at once (Slicing-by-8) */
     while (length >= 8) {
-#ifdef LITTLE_ENDIAN
+#if BYTE_ORDER == LITTLE_ENDIAN
         uint32_t one = *current++ ^ crc;
         uint32_t two = *current++;
         crc = crc32_lookup[0][(two>>24) & 0xFF] ^
@@ -682,7 +682,7 @@ static uint32_t crc32_slice16(uint32_t prev, const void *data, size_t length)
     while (length >= bytes_at_once) {
         size_t unrolling;
         for (unrolling = 0; unrolling < unroll; unrolling++) {
-#ifdef LITTLE_ENDIAN
+#if BYTE_ORDER == LITTLE_ENDIAN
         uint32_t one   = *current++ ^ crc;
         uint32_t two   = *current++;
         uint32_t three = *current++;
diff --git a/lib/crc32c.c b/lib/crc32c.c
index e33e793..66fc16e 100644
--- a/lib/crc32c.c
+++ b/lib/crc32c.c
@@ -591,7 +591,7 @@ static const uint32_t crc32c_lookup[4][256] = {
     },
 };
 
-#ifndef LITTLE_ENDIAN
+#if BYTE_ORDER != LITTLE_ENDIAN
 /* swap endianness */
 static uint32_t swap(uint32_t x)
 {
@@ -615,7 +615,7 @@ static uint32_t crc32c_sw(uint32_t crc, const void *buf, size_t len) {
 
     /* process four bytes at once (slicing-by-4) */
     while (len >= 4) {
-#ifdef LITTLE_ENDIAN
+#if BYTE_ORDER == LITTLE_ENDIAN
         crc1 = *cur++ ^ crc0;
         crc0 = crc32c_lookup[0][(crc1>>24) & 0xff] ^
                crc32c_lookup[1][(crc1>>16) & 0xff] ^
diff --git a/lib/xsha1.c b/lib/xsha1.c
index 1c4547e..6e41eee 100644
--- a/lib/xsha1.c
+++ b/lib/xsha1.c
@@ -89,7 +89,7 @@ struct _SHA_CTX {
 /* blk0() and blk() perform the initial expand. */
 /* I got the idea of expanding during the round function from SSLeay */
 
-#ifdef LITTLE_ENDIAN
+#if BYTE_ORDER == LITTLE_ENDIAN
 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&(sha1_quadbyte)0xFF00FF00) \
     |(rol(block->l[i],8)&(sha1_quadbyte)0x00FF00FF))
 #else