diff --git a/include/boost/container_hash/detail/requires_cxx11.hpp b/include/boost/container_hash/detail/requires_cxx11.hpp
deleted file mode 100644
index f123f92..0000000
--- a/include/boost/container_hash/detail/requires_cxx11.hpp
+++ /dev/null
@@ -1,22 +0,0 @@
-#ifndef BOOST_HASH_DETAIL_REQUIRES_CXX11_HPP_INCLUDED
-#define BOOST_HASH_DETAIL_REQUIRES_CXX11_HPP_INCLUDED
-
-// Copyright 2023 Peter Dimov
-// Distributed under the Boost Software License, Version 1.0.
-// https://www.boost.org/LICENSE_1_0.txt
-
-#include <boost/config.hpp>
-#include <boost/config/pragma_message.hpp>
-
-#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || \
-    defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || \
-    defined(BOOST_NO_CXX11_DECLTYPE) || \
-    defined(BOOST_NO_CXX11_CONSTEXPR) || \
-    defined(BOOST_NO_CXX11_NOEXCEPT) || \
-    defined(BOOST_NO_CXX11_HDR_TUPLE)
-
-BOOST_PRAGMA_MESSAGE("C++03 support was deprecated in Boost.ContainerHash 1.82 and will be removed in Boost.ContainerHash 1.84. Please open an issue in https://github.com/boostorg/container_hash if you want it retained.")
-
-#endif
-
-#endif // #ifndef BOOST_HASH_DETAIL_REQUIRES_CXX11_HPP_INCLUDED