diff --git a/include/boost/implicit_cast.hpp b/include/boost/implicit_cast.hpp
index 27e1639..5b1cd92 100755
--- a/include/boost/implicit_cast.hpp
+++ b/include/boost/implicit_cast.hpp
@@ -26,19 +26,4 @@ inline T implicit_cast (typename mpl::identity<T>::type x) {
 } // namespace boost
 
 
-
-// Macro for when you need a constant expression.
-// Note that 'expr' is evaluated at most once, though
-// it appears three times (provided by Gennaro Prota; see
-// http://lists.boost.org/Archives/boost/2004/05/65687.php)
-//
-#define BOOST_IMPLICIT_CAST(dest_type, expr)                          \
-                   ( static_cast<dest_type>(                          \
-                      sizeof(boost::implicit_cast<dest_type>(expr)) ? \
-                                (expr) : (expr)                       \
-                      )                                               \
-                   )                                               /**/
-
-
-
 #endif // IMPLICIT_CAST_DWA200356_HPP