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diff --git a/include/__atomic/atomic_ref.h b/include/__atomic/atomic_ref.h
index 465cd9a..301d42b 100644
--- a/include/__atomic/atomic_ref.h
+++ b/include/__atomic/atomic_ref.h
@@ -260,7 +260,7 @@ 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(
@@ -306,7 +306,7 @@ 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(
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