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diff --git a/src/third_party/boost-1.69.0/boost/serialization/string.hpp b/src/third_party/boost-1.69.0/boost/serialization/string.hpp
new file mode 100644
index 00000000000..76e695d4f3c
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+++ b/src/third_party/boost-1.69.0/boost/serialization/string.hpp
@@ -0,0 +1,30 @@
+#ifndef  BOOST_SERIALIZATION_STRING_HPP
+#define BOOST_SERIALIZATION_STRING_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// serialization/string.hpp:
+// serialization for stl string templates
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
+// Use, modification and distribution is subject to 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 for updates, documentation, and revision history.
+
+#include <string>
+
+#include <boost/config.hpp>
+#include <boost/serialization/level.hpp>
+
+BOOST_CLASS_IMPLEMENTATION(std::string, boost::serialization::primitive_type)
+#ifndef BOOST_NO_STD_WSTRING
+BOOST_CLASS_IMPLEMENTATION(std::wstring, boost::serialization::primitive_type)
+#endif
+
+#endif // BOOST_SERIALIZATION_STRING_HPP