diff --git a/include/boost/type_traits/detail/is_function_cxx_11.hpp b/include/boost/type_traits/detail/is_function_cxx_11.hpp
index 621d974..be35f58 100644
--- a/include/boost/type_traits/detail/is_function_cxx_11.hpp
+++ b/include/boost/type_traits/detail/is_function_cxx_11.hpp
@@ -104,9 +104,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -119,9 +121,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)const BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)const BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)const BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -134,9 +138,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)volatile BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)volatile BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)volatile BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -149,9 +155,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)const volatile BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)const volatile BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)const volatile BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -165,9 +173,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -180,9 +190,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)const &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)const &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)const &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -195,9 +207,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)volatile &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)volatile &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)volatile &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -210,9 +224,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)const volatile &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)const volatile &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)const volatile &BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -226,9 +242,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...) && BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)&&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)&&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -241,9 +259,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)const &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)const &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)const &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -256,9 +276,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)volatile &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)volatile &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)volatile &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
@@ -271,9 +293,11 @@ namespace boost {
 #ifndef _M_AMD64
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __stdcall(Args...)const volatile &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
+#ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __fastcall(Args...)const volatile &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
 #endif
+#endif
 #ifndef __CLR_VER
    template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
    struct is_function<Ret __vectorcall(Args...)const volatile &&BOOST_TT_NOEXCEPT_DECL> : public true_type {};
diff --git a/test/is_function_test.cpp b/test/is_function_test.cpp
index be552b0..94d96e4 100644
--- a/test/is_function_test.cpp
+++ b/test/is_function_test.cpp
@@ -94,11 +94,13 @@ typedef void __cdecl cfoo2_t(int&, double);
 typedef void __cdecl cfoo3_t(int&, bool, int, int);
 typedef void __cdecl cfoo4_t(int, bool, int*, int[], int, int, int, int, int);
 
+#ifndef __CLR_VER
 typedef void __fastcall ffoo0_t();
 typedef void __fastcall ffoo1_t(int);
 typedef void __fastcall ffoo2_t(int&, double);
 typedef void __fastcall ffoo3_t(int&, bool, int, int);
 typedef void __fastcall ffoo4_t(int, bool, int*, int[], int, int, int, int, int);
+#endif
 #if (_MSC_VER >= 1800) && !defined(__CLR_VER)
 typedef void __vectorcall vfoo0_t();
 typedef void __vectorcall vfoo1_t(int);
@@ -118,11 +120,13 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<cfoo2_t>::value, true);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<cfoo3_t>::value, true);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<cfoo4_t>::value, true);
 
+#ifndef __CLR_VER
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<ffoo0_t>::value, true);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<ffoo1_t>::value, true);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<ffoo2_t>::value, true);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<ffoo3_t>::value, true);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<ffoo4_t>::value, true);
+#endif
 
 #if (_MSC_VER >= 1800) && !defined(__CLR_VER)
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<vfoo0_t>::value, true);