diff --git a/include/boost/unordered/detail/requires_cxx11.hpp b/include/boost/unordered/detail/requires_cxx11.hpp
deleted file mode 100644
index b7c7b813..00000000
--- a/include/boost/unordered/detail/requires_cxx11.hpp
+++ /dev/null
@@ -1,21 +0,0 @@
-#ifndef BOOST_UNORDERED_DETAIL_REQUIRES_CXX11_HPP_INCLUDED
-#define BOOST_UNORDERED_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)
-
-BOOST_PRAGMA_MESSAGE("C++03 support is deprecated in Boost.Unordered 1.82 and will be removed in Boost.Unordered 1.84.")
-
-#endif
-
-#endif // #ifndef BOOST_UNORDERED_DETAIL_REQUIRES_CXX11_HPP_INCLUDED
diff --git a/include/boost/unordered/unordered_map.hpp b/include/boost/unordered/unordered_map.hpp
index 4272b402..0e948b89 100644
--- a/include/boost/unordered/unordered_map.hpp
+++ b/include/boost/unordered/unordered_map.hpp
@@ -15,7 +15,6 @@
 #endif
 
 #include <boost/unordered/detail/map.hpp>
-#include <boost/unordered/detail/requires_cxx11.hpp>
 #include <boost/unordered/detail/serialize_fca_container.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 
diff --git a/include/boost/unordered/unordered_set.hpp b/include/boost/unordered/unordered_set.hpp
index 6791210d..98ce4eca 100644
--- a/include/boost/unordered/unordered_set.hpp
+++ b/include/boost/unordered/unordered_set.hpp
@@ -14,7 +14,6 @@
 #pragma once
 #endif
 
-#include <boost/unordered/detail/requires_cxx11.hpp>
 #include <boost/unordered/detail/serialize_fca_container.hpp>
 #include <boost/unordered/detail/set.hpp>
 #include <boost/unordered/detail/type_traits.hpp>