diff --git a/include/boost/functional/hash/extensions.hpp b/include/boost/functional/hash/extensions.hpp
index 02f8bbb..c289056 100644
--- a/include/boost/functional/hash/extensions.hpp
+++ b/include/boost/functional/hash/extensions.hpp
@@ -14,6 +14,14 @@
 # pragma once
 #endif
 
+#if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+#include <boost/type_traits/is_array.hpp>
+#endif
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+#include <boost/type_traits/is_const.hpp>
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/functional/hash/hash.hpp b/include/boost/functional/hash/hash.hpp
index 6f8b313..3654cbb 100644
--- a/include/boost/functional/hash/hash.hpp
+++ b/include/boost/functional/hash/hash.hpp
@@ -21,14 +21,6 @@
 #include <boost/type_traits/is_pointer.hpp>
 #endif
 
-#if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
-#include <boost/type_traits/is_array.hpp>
-#endif
-
-#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
-#include <boost/type_traits/is_const.hpp>
-#endif
-
 namespace boost
 {
     std::size_t hash_value(bool);