diff --git a/include/functional b/include/functional
index 2a810b1a0..977ada67f 100644
--- a/include/functional
+++ b/include/functional
@@ -470,6 +470,7 @@ template <> struct hash<double>;
 template <> struct hash<long double>;
 
 template<class T> struct hash<T*>;
+template <> struct hash<nullptr_t>;  // C++17
 
 }  // std
 
diff --git a/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp b/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp
index d71514b52..36280a38e 100644
--- a/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp
+++ b/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp
@@ -41,13 +41,16 @@ test()
     assert(h(&i) != h(&j));
 }
 
+// can't hash nullptr_t until c++17
 void test_nullptr()
 {
+#if TEST_STD_VER > 14
     typedef std::nullptr_t T;
     typedef std::hash<T> H;
     static_assert((std::is_same<typename H::argument_type, T>::value), "" );
     static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
     ASSERT_NOEXCEPT(H()(T()));
+#endif
 }
 
 int main()
diff --git a/test/support/test_macros.h b/test/support/test_macros.h
index 1db3f7f8f..3cde8cc6c 100644
--- a/test/support/test_macros.h
+++ b/test/support/test_macros.h
@@ -150,11 +150,16 @@
 #define TEST_NORETURN [[noreturn]]
 #endif
 
+#if TEST_STD_VER < 11
+#define ASSERT_NOEXCEPT(...)
+#define ASSERT_NOT_NOEXCEPT(...)
+#else
 #define ASSERT_NOEXCEPT(...) \
     static_assert(noexcept(__VA_ARGS__), "Operation must be noexcept")
 
 #define ASSERT_NOT_NOEXCEPT(...) \
     static_assert(!noexcept(__VA_ARGS__), "Operation must NOT be noexcept")
+#endif
 
 /* Macros for testing libc++ specific behavior and extensions */
 #if defined(_LIBCPP_VERSION)