diff --git a/include/boost/type_traits/common_type.hpp b/include/boost/type_traits/common_type.hpp
index 2d53c25..f057770 100644
--- a/include/boost/type_traits/common_type.hpp
+++ b/include/boost/type_traits/common_type.hpp
@@ -25,9 +25,6 @@
 
 //----------------------------------------------------------------------------//
 #if defined(BOOST_NO_CXX11_DECLTYPE) && !defined(BOOST_COMMON_TYPE_DONT_USE_TYPEOF)
-#  ifndef BOOST_TYPEOF_SILENT
-#     define BOOST_TYPEOF_SILENT
-#  endif
 #include <boost/typeof/typeof.hpp>   // boost wonders never cease!
 #endif