diff --git a/include/boost/config/auto_link.hpp b/include/boost/config/auto_link.hpp
index e562caff..f5a0a007 100644
--- a/include/boost/config/auto_link.hpp
+++ b/include/boost/config/auto_link.hpp
@@ -414,7 +414,4 @@ BOOST_LIB_VERSION:    The Boost version, in the form x_y, for Boost version x.y.
 #if defined(BOOST_DYN_LINK)
 #  undef BOOST_DYN_LINK
 #endif
-#if defined(BOOST_AUTO_LINK_NOMANGLE)
-#  undef BOOST_AUTO_LINK_NOMANGLE
-#endif