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diff --git a/third-party/boost-math/include/boost/math/complex/fabs.hpp b/third-party/boost-math/include/boost/math/complex/fabs.hpp
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+++ b/third-party/boost-math/include/boost/math/complex/fabs.hpp
@@ -0,0 +1,23 @@
+//  (C) Copyright John Maddock 2005.
+//  Use, modification and distribution are 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)
+
+#ifndef BOOST_MATH_COMPLEX_FABS_INCLUDED
+#define BOOST_MATH_COMPLEX_FABS_INCLUDED
+
+#ifndef BOOST_MATH_HYPOT_INCLUDED
+#  include <boost/math/special_functions/hypot.hpp>
+#endif
+
+namespace boost{ namespace math{
+
+template<class T> 
+inline T fabs(const std::complex<T>& z)
+{
+   return ::boost::math::hypot(z.real(), z.imag());
+}
+
+} } // namespaces
+
+#endif // BOOST_MATH_COMPLEX_FABS_INCLUDED