diff --git a/libcxx/include/new b/libcxx/include/new
--- a/libcxx/include/new
+++ b/libcxx/include/new
@@ -341,6 +341,8 @@
 void* __libcpp_aligned_alloc(std::size_t __alignment, std::size_t __size) {
 #if defined(_LIBCPP_MSVCRT_LIKE)
   return ::_aligned_malloc(__size, __alignment);
+#elif _LIBCPP_STD_VER > 14
+  return ::aligned_alloc(__alignment, __size);
 #else
   void* __result = nullptr;
   (void)::posix_memalign(&__result, __alignment, __size);