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-rw-r--r--lib/libcxx/src/algorithm.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/libcxx/src/algorithm.cpp b/lib/libcxx/src/algorithm.cpp
index e9752b0653e..f036eb7abe1 100644
--- a/lib/libcxx/src/algorithm.cpp
+++ b/lib/libcxx/src/algorithm.cpp
@@ -48,7 +48,7 @@ template bool __insertion_sort_incomplete<__less<long double>&, long double*>(lo
template unsigned __sort5<__less<long double>&, long double*>(long double*, long double*, long double*, long double*, long double*, __less<long double>&);
#ifndef _LIBCPP_HAS_NO_THREADS
-static __libcpp_mutex_t __rs_mut = _LIBCPP_MUTEX_INITIALIZER;
+_LIBCPP_SAFE_STATIC static __libcpp_mutex_t __rs_mut = _LIBCPP_MUTEX_INITIALIZER;
#endif
unsigned __rs_default::__c_ = 0;