diff --git a/test/has_right_shift_test.cpp b/test/has_right_shift_test.cpp
index 9d029b1..b9f864d 100644
--- a/test/has_right_shift_test.cpp
+++ b/test/has_right_shift_test.cpp
@@ -234,7 +234,7 @@ void specific() {
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, char&, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, signed char&, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, unsigned char&, std::istream& >::value), 1);
-#if !(defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 9000))
+#if !(defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 9000)) && !defined(_HAS_CXX20)
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, char*, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, signed char*, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, unsigned char*, std::istream& >::value), 1);