diff --git a/include/boost/bind/bind.hpp b/include/boost/bind/bind.hpp
index 4cedc5e..711e000 100644
--- a/include/boost/bind/bind.hpp
+++ b/include/boost/bind/bind.hpp
@@ -2136,7 +2136,7 @@ template<class F, class A1, class A2, class A3, class A4, class A5, class A6, cl
 #undef BOOST_BIND_ST
 #undef BOOST_BIND_NOEXCEPT
 
-#ifdef BOOST_BIND_ENABLE_STDCALL
+#if defined(BOOST_BIND_ENABLE_STDCALL) && !defined(_M_X64)
 
 #define BOOST_BIND_CC __stdcall
 #define BOOST_BIND_ST
@@ -2150,7 +2150,7 @@ template<class F, class A1, class A2, class A3, class A4, class A5, class A6, cl
 
 #endif
 
-#ifdef BOOST_BIND_ENABLE_FASTCALL
+#if defined(BOOST_BIND_ENABLE_FASTCALL) && !defined(_M_X64)
 
 #define BOOST_BIND_CC __fastcall
 #define BOOST_BIND_ST
@@ -2197,7 +2197,7 @@ template<class F, class A1, class A2, class A3, class A4, class A5, class A6, cl
 #undef BOOST_BIND_MF_CC
 #undef BOOST_BIND_MF_NOEXCEPT
 
-#ifdef BOOST_MEM_FN_ENABLE_CDECL
+#if defined(BOOST_MEM_FN_ENABLE_CDECL) && !defined(_M_X64)
 
 #define BOOST_BIND_MF_NAME(X) X##_cdecl
 #define BOOST_BIND_MF_CC __cdecl
@@ -2212,7 +2212,7 @@ template<class F, class A1, class A2, class A3, class A4, class A5, class A6, cl
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_STDCALL
+#if defined(BOOST_MEM_FN_ENABLE_STDCALL) && !defined(_M_X64)
 
 #define BOOST_BIND_MF_NAME(X) X##_stdcall
 #define BOOST_BIND_MF_CC __stdcall
@@ -2227,7 +2227,7 @@ template<class F, class A1, class A2, class A3, class A4, class A5, class A6, cl
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_FASTCALL
+#if defined(BOOST_MEM_FN_ENABLE_FASTCALL) && !defined(_M_X64)
 
 #define BOOST_BIND_MF_NAME(X) X##_fastcall
 #define BOOST_BIND_MF_CC __fastcall
diff --git a/include/boost/bind/mem_fn.hpp b/include/boost/bind/mem_fn.hpp
index 956e7d8..fc83fd7 100644
--- a/include/boost/bind/mem_fn.hpp
+++ b/include/boost/bind/mem_fn.hpp
@@ -49,7 +49,7 @@ template<class V> struct mf
 #undef BOOST_MEM_FN_CC
 #undef BOOST_MEM_FN_NAME
 
-#ifdef BOOST_MEM_FN_ENABLE_CDECL
+#if defined(BOOST_MEM_FN_ENABLE_CDECL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) inner_##X##_cdecl
 #define BOOST_MEM_FN_CC __cdecl
@@ -61,7 +61,7 @@ template<class V> struct mf
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_STDCALL
+#if defined(BOOST_MEM_FN_ENABLE_STDCALL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) inner_##X##_stdcall
 #define BOOST_MEM_FN_CC __stdcall
@@ -73,7 +73,7 @@ template<class V> struct mf
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_FASTCALL
+#if defined(BOOST_MEM_FN_ENABLE_FASTCALL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) inner_##X##_fastcall
 #define BOOST_MEM_FN_CC __fastcall
@@ -102,7 +102,7 @@ template<> struct mf<void>
 #undef BOOST_MEM_FN_CC
 #undef BOOST_MEM_FN_NAME
 
-#ifdef BOOST_MEM_FN_ENABLE_CDECL
+#if defined(BOOST_MEM_FN_ENABLE_CDECL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) inner_##X##_cdecl
 #define BOOST_MEM_FN_CC __cdecl
@@ -155,7 +155,7 @@ template<> struct mf<void>
 #undef BOOST_MEM_FN_NAME2
 #undef BOOST_MEM_FN_CC
 
-#ifdef BOOST_MEM_FN_ENABLE_CDECL
+#if defined(BOOST_MEM_FN_ENABLE_CDECL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) X##_cdecl
 #define BOOST_MEM_FN_NAME2(X) inner_##X##_cdecl
@@ -217,7 +217,7 @@ namespace _mfi
 #undef BOOST_MEM_FN_CC
 #undef BOOST_MEM_FN_NAME
 
-#ifdef BOOST_MEM_FN_ENABLE_CDECL
+#if defined(BOOST_MEM_FN_ENABLE_CDECL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) X##_cdecl
 #define BOOST_MEM_FN_CC __cdecl
@@ -229,7 +229,7 @@ namespace _mfi
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_STDCALL
+#if defined(BOOST_MEM_FN_ENABLE_STDCALL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) X##_stdcall
 #define BOOST_MEM_FN_CC __stdcall
@@ -241,7 +241,7 @@ namespace _mfi
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_FASTCALL
+#if defined(BOOST_MEM_FN_ENABLE_FASTCALL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) X##_fastcall
 #define BOOST_MEM_FN_CC __fastcall
@@ -270,7 +270,7 @@ namespace _mfi
 #undef BOOST_MEM_FN_NAME
 #undef BOOST_MEM_FN_CC
 
-#ifdef BOOST_MEM_FN_ENABLE_CDECL
+#if defined(BOOST_MEM_FN_ENABLE_CDECL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) X##_cdecl
 #define BOOST_MEM_FN_CC __cdecl
@@ -282,7 +282,7 @@ namespace _mfi
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_STDCALL
+#if defined(BOOST_MEM_FN_ENABLE_STDCALL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) X##_stdcall
 #define BOOST_MEM_FN_CC __stdcall
@@ -294,7 +294,7 @@ namespace _mfi
 
 #endif
 
-#ifdef BOOST_MEM_FN_ENABLE_FASTCALL
+#if defined(BOOST_MEM_FN_ENABLE_FASTCALL) && !defined(_M_X64)
 
 #define BOOST_MEM_FN_NAME(X) X##_fastcall
 #define BOOST_MEM_FN_CC __fastcall