diff --git a/include/boost/unordered/detail/foa.hpp b/include/boost/unordered/detail/foa.hpp
index fca3b2c0..cf1ce6a7 100644
--- a/include/boost/unordered/detail/foa.hpp
+++ b/include/boost/unordered/detail/foa.hpp
@@ -604,7 +604,14 @@ struct xmx_mix
   template<typename Hash,typename T>
   static inline std::size_t mix(const Hash& h,const T& x)
   {
-    return xmx(h(x));
+    //return xmx(h(x));
+    boost::uint64_t z=(boost::uint64_t)(h(x));
+
+    z^=z>>23;
+    z*=0xff51afd7ed558ccdull;
+    z^=z>>23;
+
+    return (std::size_t)z;
   }
 };