diff --git a/include/boost/unordered/unordered_flat_map.hpp b/include/boost/unordered/unordered_flat_map.hpp
index 9229f381..75cad9a4 100644
--- a/include/boost/unordered/unordered_flat_map.hpp
+++ b/include/boost/unordered/unordered_flat_map.hpp
@@ -7,6 +7,7 @@
 #endif
 
 #include <boost/unordered/detail/foa.hpp>
+#include <boost/unordered/unordered_flat_map_fwd.hpp>
 
 #include <boost/core/allocator_access.hpp>
 
diff --git a/include/boost/unordered/unordered_flat_map_fwd.hpp b/include/boost/unordered/unordered_flat_map_fwd.hpp
new file mode 100644
index 00000000..154b9093
--- /dev/null
+++ b/include/boost/unordered/unordered_flat_map_fwd.hpp
@@ -0,0 +1,30 @@
+
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_FLAT_MAP_FWD_HPP_INCLUDED
+#define BOOST_UNORDERED_FLAT_MAP_FWD_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/functional/hash_fwd.hpp>
+#include <boost/unordered/detail/fwd.hpp>
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    template <class Key, class T, class Hash = boost::hash<Key>,
+      class KeyEqual = std::equal_to<Key>,
+      class Allocator = std::allocator<std::pair<const Key, T> > >
+    class unordered_flat_map;
+  }
+
+  using boost::unordered::unordered_flat_map;
+} // namespace boost
+
+#endif
diff --git a/include/boost/unordered_flat_map.hpp b/include/boost/unordered_flat_map.hpp
new file mode 100644
index 00000000..bed3bc05
--- /dev/null
+++ b/include/boost/unordered_flat_map.hpp
@@ -0,0 +1,18 @@
+
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/unordered for documentation
+
+#ifndef BOOST_UNORDERED_FLAT_MAP_HPP_INCLUDED
+#define BOOST_UNORDERED_FLAT_MAP_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/unordered/unordered_flat_map.hpp>
+
+#endif // BOOST_UNORDERED_FLAT_MAP_HPP_INCLUDED
\ No newline at end of file