diff --git a/include/boost/type_traits/composite_traits.hpp b/include/boost/type_traits/composite_traits.hpp
index 359d1b8..fd7b62d 100644
--- a/include/boost/type_traits/composite_traits.hpp
+++ b/include/boost/type_traits/composite_traits.hpp
@@ -20,8 +20,6 @@
 #ifndef COMPOSITE_TYPE_TRAITS_HPP
 #define COMPOSITE_TYPE_TRAITS_HPP
 
-#include <cstddef>
-
 #ifndef BOOST_ICE_TYPE_TRAITS_HPP
 #include <boost/type_traits/ice.hpp>
 #endif
diff --git a/include/boost/type_traits/fwd.hpp b/include/boost/type_traits/fwd.hpp
index 2aff24e..660fdf9 100644
--- a/include/boost/type_traits/fwd.hpp
+++ b/include/boost/type_traits/fwd.hpp
@@ -12,6 +12,7 @@
 #define BOOST_FWD_TYPE_TRAITS_HPP
 
 #include <cstdlib>
+#include <cstddef>
 
 #ifndef BOOST_CONFIG_HPP
 #include <boost/config.hpp>