diff --git a/include/boost/container_hash/detail/hash_range.hpp b/include/boost/container_hash/detail/hash_range.hpp
index 97e2c7c..db7bb55 100644
--- a/include/boost/container_hash/detail/hash_range.hpp
+++ b/include/boost/container_hash/detail/hash_range.hpp
@@ -257,7 +257,7 @@ std::size_t>::type
     std::size_t n = static_cast<std::size_t>( last - first );
 
     boost::uint64_t const q = 0x9e3779b97f4a7c15ULL;
-    boost::uint64_t const k = q * q;
+    boost::uint64_t const k = 0xdf442d22ce4859b9ULL; // q * q
 
     boost::uint64_t w = mulx( seed + q, k );
     boost::uint64_t h = w ^ n;
@@ -309,7 +309,7 @@ std::size_t>::type
     std::size_t n = 0;
 
     boost::uint64_t const q = 0x9e3779b97f4a7c15ULL;
-    boost::uint64_t const k = q * q;
+    boost::uint64_t const k = 0xdf442d22ce4859b9ULL; // q * q
 
     boost::uint64_t w = mulx( seed + q, k );
     boost::uint64_t h = w;