diff --git a/libstdc++-v3/include/bits/iterator_concepts.h b/libstdc++-v3/include/bits/iterator_concepts.h
index d18ae32bf20..11748e5ed7b 100644
--- a/libstdc++-v3/include/bits/iterator_concepts.h
+++ b/libstdc++-v3/include/bits/iterator_concepts.h
@@ -930,7 +930,8 @@ namespace ranges
   {
     using std::__detail::__class_or_enum;
 
-    struct {
+    struct _Decay_copy final
+    {
       template<typename _Tp>
 	constexpr decay_t<_Tp>
 	operator()(_Tp&& __t) const