diff --git a/include/boost/concept_check.hpp b/include/boost/concept_check.hpp
index b853329..b75364f 100644
--- a/include/boost/concept_check.hpp
+++ b/include/boost/concept_check.hpp
@@ -134,7 +134,7 @@ struct require_same { typedef T type; };
   template <> struct SignedIntegerConcept<short> { void constraints() {} };
   template <> struct SignedIntegerConcept<int> { void constraints() {} };
   template <> struct SignedIntegerConcept<long> { void constraints() {} };
-# if (defined(ULLONG_MAX) || defined(ULONG_LONG_MAX))
+# if defined(BOOST_HAS_LONG_LONG)
   template <> struct SignedIntegerConcept<long long> { void constraints() {} };
 # endif
   // etc.