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diff --git a/include/__locale b/include/__locale
index 4b38276..8784b24 100644
--- a/include/__locale
+++ b/include/__locale
@@ -17,6 +17,7 @@
#include <__type_traits/make_unsigned.h>
#include <__utility/no_destroy.h>
#include <__utility/private_constructor_tag.h>
+#include <atomic>
#include <cctype>
#include <clocale>
#include <cstdint>
@@ -128,8 +129,7 @@ private:
};
class _LIBCPP_EXPORTED_FROM_ABI locale::id {
- once_flag __flag_;
- int32_t __id_;
+ std::atomic<int32_t> __id_;
static int32_t __next_id;
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