diff --git a/include/boost/detail/endian.hpp b/include/boost/detail/endian.hpp
index 5f12fbe..190fe98 100644
--- a/include/boost/detail/endian.hpp
+++ b/include/boost/detail/endian.hpp
@@ -47,7 +47,10 @@
 #elif defined(__i386__) || defined(__alpha__) \
    || defined(__ia64) || defined(__ia64__) \
    || defined(_M_IX86) || defined(_M_IA64) \
-   || defined(_M_ALPHA)
+   || defined(_M_ALPHA) || defined(__amd64) \
+   || defined(__amd64__) || defined(_M_AMD64) \
+   || defined(__x86_64) || defined(__x86_64__) \
+   || defined(_M_X64)
 # define BOOST_LITTLE_ENDIAN
 # define BOOST_BYTE_ORDER 1234
 #else