diff --git a/libcxx/include/__utility/decay_copy.h b/libcxx/include/__utility/decay_copy.h
--- a/libcxx/include/__utility/decay_copy.h
+++ b/libcxx/include/__utility/decay_copy.h
@@ -21,7 +21,8 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY typename decay<_Tp>::type __decay_copy(_Tp&& __t)
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
+typename decay<_Tp>::type __decay_copy(_Tp&& __t)
 #if _LIBCPP_STD_VER > 17
     noexcept(is_nothrow_convertible_v<_Tp, remove_reference_t<_Tp> >)
 #endif