1 files changed, 2 insertions, 1 deletions
diff --git a/test/std/atomics/atomics.flag/default.pass.cpp b/test/std/atomics/atomics.flag/default.pass.cpp
index 45f5e709245b..11c08f50266a 100644
--- a/test/std/atomics/atomics.flag/default.pass.cpp
+++ b/test/std/atomics/atomics.flag/default.pass.cpp
@@ -22,7 +22,8 @@
 int main()
 {
     std::atomic_flag f;
-
+    f.clear();
+    assert(f.test_and_set() == 0);
     {
         typedef std::atomic_flag A;
         _ALIGNAS_TYPE(A) char storage[sizeof(A)] = {1};