diff --git a/build/vc100/turtle.vcxproj b/build/vc100/turtle.vcxproj
index b53cd31..5147023 100644
--- a/build/vc100/turtle.vcxproj
+++ b/build/vc100/turtle.vcxproj
@@ -47,7 +47,6 @@
     <ClInclude Include="..\..\turtle\detail\signature.hpp" />
     <ClInclude Include="..\..\turtle\detail\type_name.hpp" />
     <ClInclude Include="..\..\turtle\detail\verifiable.hpp" />
-    <ClInclude Include="..\..\turtle\detail\yes_no_type.hpp" />
     <ClInclude Include="..\..\turtle\error.hpp" />
     <ClInclude Include="..\..\turtle\format.hpp" />
     <ClInclude Include="..\..\turtle\log.hpp" />
diff --git a/build/vc100/turtle.vcxproj.filters b/build/vc100/turtle.vcxproj.filters
index f4eff3e..05804aa 100644
--- a/build/vc100/turtle.vcxproj.filters
+++ b/build/vc100/turtle.vcxproj.filters
@@ -61,9 +61,6 @@
     <ClInclude Include="..\..\turtle\detail\verifiable.hpp">
       <Filter>Source Files\detail</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\turtle\detail\yes_no_type.hpp">
-      <Filter>Source Files\detail</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\turtle\detail\action.hpp">
       <Filter>Source Files\detail</Filter>
     </ClInclude>
diff --git a/turtle/detail/is_functor.hpp b/turtle/detail/is_functor.hpp
index a7db376..f8c96ce 100644
--- a/turtle/detail/is_functor.hpp
+++ b/turtle/detail/is_functor.hpp
@@ -9,7 +9,6 @@
 #ifndef MOCK_IS_FUNCTOR_HPP_INCLUDED
 #define MOCK_IS_FUNCTOR_HPP_INCLUDED
 
-#include "yes_no_type.hpp"
 #include <boost/function_types/is_callable_builtin.hpp>
 #include <boost/mpl/has_xxx.hpp>
 #include <boost/mpl/bool.hpp>
diff --git a/turtle/detail/yes_no_type.hpp b/turtle/detail/yes_no_type.hpp
deleted file mode 100644
index a007f55..0000000
--- a/turtle/detail/yes_no_type.hpp
+++ /dev/null
@@ -1,31 +0,0 @@
-// http://turtle.sourceforge.net
-//
-// Copyright Mathieu Champlon 2011
-//
-// Distributed under the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
-
-#ifndef MOCK_YES_NO_TYPE_HPP_INCLUDED
-#define MOCK_YES_NO_TYPE_HPP_INCLUDED
-
-#include <boost/static_assert.hpp>
-
-namespace mock
-{
-namespace detail
-{
-    typedef char no_type;
-    struct yes_type
-    {
-        char no_type[2];
-    };
-    BOOST_STATIC_ASSERT( sizeof( yes_type ) != sizeof( no_type ) );
-
-    template< typename T > void operator,( yes_type, const T& );
-    no_type operator,( yes_type, yes_type );
-    no_type operator,( no_type, yes_type );
-}
-} // mock
-
-#endif // MOCK_YES_NO_TYPE_HPP_INCLUDED