diff --git a/include/boost/config/detail/suffix.hpp b/include/boost/config/detail/suffix.hpp
index a6e287c7..b1be2a86 100644
--- a/include/boost/config/detail/suffix.hpp
+++ b/include/boost/config/detail/suffix.hpp
@@ -1215,13 +1215,6 @@ namespace std{ using ::type_info; }
 //
 #include <boost/config/detail/cxx_composite.hpp>
 
-//
-// Define the std level that the compiler claims to support:
-//
-#ifndef BOOST_CXX_VERSION
-#  define BOOST_CXX_VERSION __cplusplus
-#endif
-
 //
 // Finish off with checks for macros that are depricated / no longer supported,
 // if any of these are set then it's very likely that much of Boost will no