diff --git a/include/boost/cast.hpp b/include/boost/cast.hpp
index 1311d3a..fcbad0d 100644
--- a/include/boost/cast.hpp
+++ b/include/boost/cast.hpp
@@ -121,7 +121,7 @@ namespace boost
 
 //  numeric_cast  ------------------------------------------------------------//
 
-#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
+#if !defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) || defined(BOOST_SGI_CPP_LIMITS)
   
     namespace detail
     {
@@ -295,7 +295,7 @@ namespace boost
         typedef std::numeric_limits<Source> arg_traits;
         typedef detail::fixed_numeric_limits<Target> result_traits;
         
-#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
+#if !defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) || defined(BOOST_SGI_CPP_LIMITS)
         // typedefs that act as compile time assertions
         // (to be replaced by boost compile time assertions
         // as and when they become available and are stable)