diff --git a/.drone/boost.sh b/.drone/boost.sh
index f89dfb9..6acbbef 100755
--- a/.drone/boost.sh
+++ b/.drone/boost.sh
@@ -49,7 +49,7 @@ echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
 IFS=','
 for CXXLOCAL in $CXXSTD; do  (cd libs/config/test && ../../../b2 config_info_travis_install toolset=$TOOLSET cxxstd=$CXXLOCAL $CXXSTD_DIALECT && echo With Standard Version $CXXLOCAL && ./config_info_travis && rm ./config_info_travis)  done
 unset IFS
-./b2 -j3 libs/type_traits/test toolset=$TOOLSET cxxstd=$CXXSTD $CXXSTD_DIALECT
+./b2 libs/type_traits/test toolset=$TOOLSET cxxstd=$CXXSTD $CXXSTD_DIALECT
 
 echo '==================================> AFTER_SUCCESS'
 
diff --git a/test/has_right_shift_test.cpp b/test/has_right_shift_test.cpp
index ff6a4da..9d029b1 100644
--- a/test/has_right_shift_test.cpp
+++ b/test/has_right_shift_test.cpp
@@ -234,9 +234,11 @@ 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))
    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);
+#endif
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, std::string&, std::istream& >::value), 1);
 }