diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
index ac8f4ea78bda..45cdf646340a 100644
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
@@ -38,7 +38,7 @@ ms ShortTime = ms(50);
 
 static const unsigned Threads = 5;
 
-std::atomic<unsigned> CountDown = Threads;
+std::atomic<unsigned> CountDown(Threads);
 
 void f1()
 {
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
index 6a26f7ec66fd..9a3e222e30a0 100644
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
@@ -38,7 +38,7 @@ ms ShortTime = ms(50);
 
 static constexpr unsigned Threads = 5;
 
-std::atomic<unsigned> CountDown = Threads;
+std::atomic<unsigned> CountDown(Threads);
 
 void f1()
 {