diff --git a/include/boost/asio/windows/basic_random_access_handle.hpp b/include/boost/asio/windows/basic_random_access_handle.hpp
index e3603052..0f2abb84 100644
--- a/include/boost/asio/windows/basic_random_access_handle.hpp
+++ b/include/boost/asio/windows/basic_random_access_handle.hpp
@@ -44,6 +44,14 @@ public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
+  /// The native representation of a handle.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#else
+  typedef boost::asio::detail::win_iocp_handle_service::native_handle_type
+    native_handle_type;
+#endif
+
   /// Construct a random-access handle without opening it.
   /**
    * This constructor creates a random-access handle without opening it.
diff --git a/include/boost/asio/windows/basic_stream_handle.hpp b/include/boost/asio/windows/basic_stream_handle.hpp
index e39e225f..40d5abb2 100644
--- a/include/boost/asio/windows/basic_stream_handle.hpp
+++ b/include/boost/asio/windows/basic_stream_handle.hpp
@@ -47,6 +47,14 @@ public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
+  /// The native representation of a handle.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#else
+  typedef boost::asio::detail::win_iocp_handle_service::native_handle_type
+    native_handle_type;
+#endif
+
   /// Construct a stream handle without opening it.
   /**
    * This constructor creates a stream handle without opening it.