diff --git a/libcxx/include/ostream b/libcxx/include/ostream
--- a/libcxx/include/ostream
+++ b/libcxx/include/ostream
@@ -225,9 +225,13 @@
 
     basic_ostream& operator<<(basic_streambuf<char_type, traits_type>* __sb);
 
+#if _LIBCPP_STD_VER > 14
+// LWG 2221 - nullptr. This is not backported to older standards modes.
+// See https://reviews.llvm.org/D127033 for more info on the rationale.
     _LIBCPP_INLINE_VISIBILITY
     basic_ostream& operator<<(nullptr_t)
     { return *this << "nullptr"; }
+#endif
 
     // 27.7.2.7 Unformatted output:
     basic_ostream& put(char_type __c);
diff --git a/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp b/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp
--- a/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp
+++ b/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp
@@ -67,13 +67,17 @@
         os << &sb2;
         assert(sb.str() == "testing...");
     }
-    { // LWG 2221 - nullptr
+#if TEST_STD_VER > 14
+// LWG 2221 - nullptr. This is not backported to older standards modes.
+// See https://reviews.llvm.org/D127033 for more info on the rationale.
+    {
         testbuf<char> sb;
         std::ostream os(&sb);
         os << nullptr;
         assert(sb.str().size() != 0);
         LIBCPP_ASSERT(sb.str() == "nullptr");
     }
+#endif
 
   return 0;
 }