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-rw-r--r--include/atomic2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/atomic b/include/atomic
index 6a200eba599f..6dffdb21fde4 100644
--- a/include/atomic
+++ b/include/atomic
@@ -555,7 +555,7 @@ kill_dependency(_Tp __y) _NOEXCEPT
template <class _Tp, bool = is_integral<_Tp>::value && !is_same<_Tp, bool>::value>
struct __atomic_base // false
{
- _Atomic(_Tp) __a_;
+ mutable _Atomic(_Tp) __a_;
_LIBCPP_INLINE_VISIBILITY
bool is_lock_free() const volatile _NOEXCEPT