diff --git a/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h b/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h
index 156f1961151..f5ab6ffc9e7 100644
--- a/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h
+++ b/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h
@@ -241,7 +241,7 @@ template <class _Tp>
 struct atomic_ref<_Tp> : public __atomic_ref_base<_Tp> {
   using __base = __atomic_ref_base<_Tp>;
 
-  using difference_type = __base::value_type;
+  using difference_type = typename __base::value_type;
 
   _LIBCPP_HIDE_FROM_ABI explicit atomic_ref(_Tp& __obj) : __base(__obj) {
     _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
@@ -287,7 +287,7 @@ template <class _Tp>
 struct atomic_ref<_Tp> : public __atomic_ref_base<_Tp> {
   using __base = __atomic_ref_base<_Tp>;
 
-  using difference_type = __base::value_type;
+  using difference_type = typename __base::value_type;
 
   _LIBCPP_HIDE_FROM_ABI explicit atomic_ref(_Tp& __obj) : __base(__obj) {
     _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(