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diff --git a/include/__locale b/include/__locale
index 90dcad3..538bf7a 100644
--- a/include/__locale
+++ b/include/__locale
@@ -15,6 +15,7 @@
#include <__memory/shared_ptr.h> // __shared_count
#include <__mutex/once_flag.h>
#include <__type_traits/make_unsigned.h>
+#include <atomic>
#include <cctype>
#include <clocale>
#include <cstdint>
@@ -154,8 +155,7 @@ private:
class _LIBCPP_EXPORTED_FROM_ABI locale::id
{
- once_flag __flag_;
- int32_t __id_;
+ std::atomic<int32_t> __id_;
static int32_t __next_id;
public:
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