diff --git a/include/boost/mpl/aux_/nested_type_wknd.hpp b/include/boost/mpl/aux_/nested_type_wknd.hpp
index 51f0252..1058a20 100644
--- a/include/boost/mpl/aux_/nested_type_wknd.hpp
+++ b/include/boost/mpl/aux_/nested_type_wknd.hpp
@@ -21,7 +21,8 @@
 
 #if defined(__GNUC__) && (__GNUC__ < 3 || __GNUC__ == 3 && __GNUC_MINOR__ <= 2 \
     || !defined(BOOST_STRICT_CONFIG)) \
- || defined(__BORLANDC__) && (__BORLANDC__ <= 0x561 || !defined(BOOST_STRICT_CONFIG))
+ || defined(__BORLANDC__) && (__BORLANDC__ <= 0x561 || !defined(BOOST_STRICT_CONFIG)) \
+ || defined(__SUNPRO_CC)
 
 namespace boost { namespace mpl { namespace aux {