diff --git a/include/boost/config/select_stdlib_config.hpp b/include/boost/config/select_stdlib_config.hpp
index 13e5e4ce..40a58fc2 100644
--- a/include/boost/config/select_stdlib_config.hpp
+++ b/include/boost/config/select_stdlib_config.hpp
@@ -12,12 +12,12 @@
 // locate which std lib we are using and define BOOST_STDLIB_CONFIG as needed:
 
 // we need to include a std lib header here in order to detect which
-// library is in use, use <utility> as it's about the smallest
-// of the std lib headers - do not rely on this header being included -
+// library is in use, use <cstddef> as it's one of the smaller std lib headers 
+// - do not rely on this header being included -
 // users can short-circuit this header if they know whose std lib
 // they are using.
 
-#include <boost/config/no_tr1/utility.hpp>
+#include <cstddef>
 
 #if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
 // STLPort library; this _must_ come first, otherwise since
diff --git a/include/boost/config/stdlib/stlport.hpp b/include/boost/config/stdlib/stlport.hpp
index 8d0677ea..82e4cff5 100644
--- a/include/boost/config/stdlib/stlport.hpp
+++ b/include/boost/config/stdlib/stlport.hpp
@@ -10,7 +10,7 @@
 //  STLPort standard library config:
 
 #if !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
-#  include <boost/config/no_tr1/utility.hpp>
+#  include <cstddef>
 #  if !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
 #      error "This is not STLPort!"
 #  endif