diff --git a/include/boost/intrusive/detail/utilities.hpp b/include/boost/intrusive/detail/utilities.hpp
index 5e6abdb..ab7b02c 100644
--- a/include/boost/intrusive/detail/utilities.hpp
+++ b/include/boost/intrusive/detail/utilities.hpp
@@ -429,6 +429,8 @@ struct sqrt2_pow_max<SizeType, typename enable_if< numbits_eq<SizeType, 32> >::t
    static const std::size_t pow   = 31;
 };
 
+#ifndef BOOST_NO_INT64_T
+
 template <class SizeType>
 struct sqrt2_pow_max<SizeType, typename enable_if< numbits_eq<SizeType, 64> >::type>
 {
@@ -436,6 +438,8 @@ struct sqrt2_pow_max<SizeType, typename enable_if< numbits_eq<SizeType, 64> >::t
    static const std::size_t pow   = 63;
 };
 
+#endif   //BOOST_NO_INT64_T
+
 // Returns floor(pow(sqrt(2), x * 2 + 1)).
 // Defined for X from 0 up to the number of bits in size_t minus 1.
 inline std::size_t sqrt2_pow_2xplus1 (std::size_t x)