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diff --git a/include/jsoncons/detail/endian.hpp b/include/jsoncons/detail/endian.hpp
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+// Copyright 2020 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_DETAIL_ENDIAN_HPP
+#define JSONCONS_DETAIL_ENDIAN_HPP
+
+#if defined(__sun)
+#  include <sys/byteorder.h>
+#endif
+
+namespace jsoncons { 
+namespace detail {
+
+    enum class endian
+    {
+    #if defined(_MSC_VER) 
+    // MSVC, which implies Windows, which implies little-endian
+         little = 0,
+         big    = 1,
+         native = little
+    #elif defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__BYTE_ORDER__) 
+         little = __ORDER_LITTLE_ENDIAN__,
+         big    = __ORDER_BIG_ENDIAN__,
+         native = __BYTE_ORDER__
+    #elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)
+        little = 0,
+        big    = 1,
+        native = big
+    #elif !defined(_BIG_ENDIAN) && defined(_LITTLE_ENDIAN)
+        little = 0,
+        big    = 1,
+        native = little
+    #else
+    #error "Unable to determine byte order!"
+    #endif
+    };
+
+} // namespace detail
+} // namespace jsoncons
+
+#endif