diff --git a/include/boost/smart_ptr/detail/sp_nullptr_t.hpp b/include/boost/smart_ptr/detail/sp_nullptr_t.hpp
index ccbb123..219ae80 100644
--- a/include/boost/smart_ptr/detail/sp_nullptr_t.hpp
+++ b/include/boost/smart_ptr/detail/sp_nullptr_t.hpp
@@ -26,7 +26,7 @@ namespace boost
 namespace detail
 {
 
-#if defined( __clang__ ) && !defined( _LIBCPP_VERSION ) && !defined( BOOST_NO_CXX11_DECLTYPE )
+#if !defined( BOOST_NO_CXX11_DECLTYPE ) && ( ( defined( __clang__ ) && !defined( _LIBCPP_VERSION ) ) || defined( __INTEL_COMPILER ) )
 
     typedef decltype(nullptr) sp_nullptr_t;