diff --git a/include/boost/iterator_adaptors.hpp b/include/boost/iterator_adaptors.hpp
index 35b1c56..1cba09a 100644
--- a/include/boost/iterator_adaptors.hpp
+++ b/include/boost/iterator_adaptors.hpp
@@ -800,22 +800,20 @@ struct iterator_adaptor :
  private:
     BOOST_STATIC_CONSTANT(bool, is_input_or_output_iter
           = (boost::is_convertible<iterator_category*,std::input_iterator_tag*>::value
-             || boost::is_convertible<iterator_category*,std::output_iterator_tag*>::value));
+             | boost::is_convertible<iterator_category*,std::output_iterator_tag*>::value));
 
     // Iterators should satisfy one of the known categories
     BOOST_STATIC_ASSERT(is_input_or_output_iter);
 
-#if !defined(BOOST_MSVC)
     // Iterators >= ForwardIterator must produce real references
     // as required by the C++ standard requirements in Table 74.
-    BOOST_STATIC_CONSTANT(bool, forward_iter_with_real_reference =
-           (!boost::is_convertible<iterator_category*,std::forward_iterator_tag*>::value
-           || boost::is_same<reference,value_type&>::value
-           || boost::is_same<reference,const value_type&>::value));
+    BOOST_STATIC_CONSTANT(bool, forward_iter_with_real_reference
+                          = ((!boost::is_convertible<iterator_category*,std::forward_iterator_tag*>::value)
+                             | boost::is_same<reference,value_type&>::value
+                             | boost::is_same<reference,const value_type&>::value));
     
     // This check gives incorrect results in iter_traits_gen_test.cpp
     BOOST_STATIC_ASSERT(forward_iter_with_real_reference);
-#endif
 
  public:
     iterator_adaptor() { }