diff --git a/include/boost/charconv/detail/integer_conversion.hpp b/include/boost/charconv/detail/integer_conversion.hpp
deleted file mode 100644
index b26b5c5..0000000
--- a/include/boost/charconv/detail/integer_conversion.hpp
+++ /dev/null
@@ -1,45 +0,0 @@
-// Copyright 2023 Matt Borland
-// Distributed under the Boost Software License, Version 1.0.
-// https://www.boost.org/LICENSE_1_0.txt
-
-#ifndef BOOST_CHARCONV_DETAIL_CONCATENATE_HPP
-#define BOOST_CHARCONV_DETAIL_CONCATENATE_HPP
-
-#include <boost/charconv/detail/config.hpp>
-#include <utility>
-#include <limits>
-#include <cstdint>
-
-namespace boost { namespace charconv { namespace detail {
-
-constexpr std::uint64_t pack(std::uint32_t word1, std::uint32_t word2) noexcept
-{
-    return static_cast<std::uint64_t>(word1) << 32 | word2;
-}
-
-BOOST_CXX14_CONSTEXPR inline std::pair<std::uint32_t, std::uint32_t> unpack(std::uint64_t value)
-{
-    auto x = static_cast<std::uint32_t>(value >> UINT64_C(32));
-    auto y = static_cast<std::uint32_t>(value & UINT32_MAX);
-
-    return std::make_pair(x, y);
-}
-
-#ifdef __GLIBCXX_TYPE_INT_N_0
-constexpr unsigned __int128 pack(std::uint64_t word1, std::uint64_t word2) noexcept
-{
-    return static_cast<unsigned __int128>(word1) << 64 | word2;
-}
-
-BOOST_CXX14_CONSTEXPR inline std::pair<std::uint64_t, std::uint64_t> unpack(unsigned __int128 value)
-{
-    auto x = static_cast<std::uint64_t>(value >> 64);
-    auto y = static_cast<std::uint64_t>(value);
-
-    return std::make_pair(x, y);
-}
-#endif // defined(__GLIBCXX_TYPE_INT_N_0)
-
-}}} // Namespaces
-
-#endif // BOOST_CHARCONV_DETAIL_CONCATENATE_HPP
diff --git a/include/boost/charconv/to_chars.hpp b/include/boost/charconv/to_chars.hpp
index 1752e2b..a357740 100644
--- a/include/boost/charconv/to_chars.hpp
+++ b/include/boost/charconv/to_chars.hpp
@@ -9,7 +9,6 @@
 
 #include <boost/charconv/detail/apply_sign.hpp>
 #include <boost/charconv/detail/integer_search_trees.hpp>
-#include <boost/charconv/detail/integer_conversion.hpp>
 #include <boost/charconv/detail/memcpy.hpp>
 #include <boost/charconv/detail/config.hpp>
 #include <boost/charconv/detail/floff.hpp>