diff --git a/build/vc100/turtle_test.vcxproj b/build/vc100/turtle_test.vcxproj
index c92c1d5..0b1bc7e 100644
--- a/build/vc100/turtle_test.vcxproj
+++ b/build/vc100/turtle_test.vcxproj
@@ -22,6 +22,7 @@
     <ClInclude Include="..\..\test\mock_error.hpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="..\..\test\detail\test_check.cpp" />
     <ClCompile Include="..\..\test\detail\test_function.cpp" />
     <ClCompile Include="..\..\test\detail\test_invocation.cpp" />
     <ClCompile Include="..\..\test\detail\test_is_functor.cpp" />
diff --git a/build/vc100/turtle_test.vcxproj.filters b/build/vc100/turtle_test.vcxproj.filters
index d759aa9..a0f662a 100644
--- a/build/vc100/turtle_test.vcxproj.filters
+++ b/build/vc100/turtle_test.vcxproj.filters
@@ -54,5 +54,8 @@
     <ClCompile Include="..\..\test\detail\test_is_functor.cpp">
       <Filter>Source Files\detail</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\test\detail\test_check.cpp">
+      <Filter>Source Files\detail</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/test/detail/test_check.cpp b/test/detail/test_check.cpp
new file mode 100644
index 0000000..a4250c6
--- /dev/null
+++ b/test/detail/test_check.cpp
@@ -0,0 +1,32 @@
+// http://turtle.sourceforge.net
+//
+// Copyright Mathieu Champlon 2012
+//
+// 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)
+
+#include <turtle/detail/check.hpp>
+#include <boost/test/auto_unit_test.hpp>
+
+namespace
+{
+    template< typename Expected, typename Actual >
+    bool check( Expected expected, Actual actual )
+    {
+        return mock::detail::check< Expected, Actual >( expected )( actual );
+    }
+}
+
+BOOST_AUTO_TEST_CASE( int_and_int_can_be_compared )
+{
+    BOOST_CHECK( check( 3, 3 ) );
+    BOOST_CHECK( ! check( 3, 4 ) );
+    BOOST_CHECK( ! check( 4, 3 ) );
+}
+
+BOOST_AUTO_TEST_CASE( ref_to_int_and_int_can_be_compared )
+{
+    BOOST_CHECK( check< int >( boost::cref( 3 ), 3 ) );
+    BOOST_CHECK( ! check< int >( boost::cref( 3 ), 4 ) );
+}
diff --git a/turtle/detail/check.hpp b/turtle/detail/check.hpp
index 6fd462a..55f6054 100644
--- a/turtle/detail/check.hpp
+++ b/turtle/detail/check.hpp
@@ -44,11 +44,11 @@ namespace detail
         explicit check( Expected expected )
             : expected_( expected )
         {}
-    private:
         virtual bool operator()( Actual actual )
         {
             return actual == boost::unwrap_ref( expected_ );
         }
+    private:
         virtual void serialize( std::ostream& s ) const
         {
             s << mock::format( expected_ );
@@ -65,11 +65,11 @@ namespace detail
         explicit check( const constraint< Constraint >& c )
             : c_( c.f_ )
         {}
-    private:
         virtual bool operator()( Actual actual )
         {
             return c_( actual );
         }
+    private:
         virtual void serialize( std::ostream& s ) const
         {
             s << mock::format( c_ );
@@ -89,11 +89,11 @@ namespace detail
         explicit check( const Functor& f )
             : f_( f )
         {}
-    private:
         virtual bool operator()( Actual actual )
         {
             return f_( actual );
         }
+    private:
         virtual void serialize( std::ostream& s ) const
         {
             s << mock::format( f_ );