diff --git a/include/boost/functional/hash/extensions.hpp b/include/boost/functional/hash/extensions.hpp
index dc59b45..4358736 100644
--- a/include/boost/functional/hash/extensions.hpp
+++ b/include/boost/functional/hash/extensions.hpp
@@ -179,7 +179,7 @@ namespace boost
 
 #endif
 
-#if !defined(BOOST_NO_CXX11_HDR_MEMORY)
+#if !defined(BOOST_NO_CXX11_SMART_PTR)
     template <typename T>
     inline std::size_t hash_value(std::shared_ptr<T> const& x) {
         return boost::hash_value(x.get());
diff --git a/test/hash_std_smart_ptr_test.cpp b/test/hash_std_smart_ptr_test.cpp
index 83e705b..7452585 100644
--- a/test/hash_std_smart_ptr_test.cpp
+++ b/test/hash_std_smart_ptr_test.cpp
@@ -14,7 +14,7 @@
 #include <boost/detail/lightweight_test.hpp>
 #include "./compile_time.hpp"
 
-#if defined(TEST_EXTENSIONS) && !defined(BOOST_NO_CXX11_HDR_TUPLE)
+#if defined(TEST_EXTENSIONS) && !defined(BOOST_NO_CXX11_SMART_PTR)
 #define TEST_SMART_PTRS
 #include <memory>
 #endif