diff --git a/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp b/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp
index 99cdd1291bb0..74fe166a0cd9 100644
--- a/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp
@@ -19,7 +19,9 @@ int main()
 {
     typedef std::less<int> F;
     const F f = F();
-    static_assert((std::is_base_of<std::binary_function<int, int, bool>, F>::value), "");
+    static_assert((std::is_same<int, F::first_argument_type>::value), "" );
+    static_assert((std::is_same<int, F::second_argument_type>::value), "" );
+    static_assert((std::is_same<bool, F::result_type>::value), "" );
     assert(!f(36, 36));
     assert(!f(36, 6));
     assert(f(6, 36));