diff --git a/include/boost/config.hpp b/include/boost/config.hpp
index 251fb0d8..3733402f 100644
--- a/include/boost/config.hpp
+++ b/include/boost/config.hpp
@@ -271,6 +271,7 @@
 #     define BOOST_NO_INCLASS_MEMBER_INITIALIZATION
 #     define BOOST_NO_PRIVATE_IN_AGGREGATE
 
+#     define BOOST_NO_INTEGRAL_INT64_T
 #     define BOOST_NO_INTRINSIC_WCHAR_T
 
 //    VC++ 6.0 has member templates but they have numerous problems including