1 files changed, 2 insertions, 0 deletions
diff --git a/libcxx/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp
index 21011ed17cd..62f1b784b7d 100644
--- a/libcxx/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp
@@ -20,10 +20,12 @@ int main()
 {
     {
     std::once_flag f;
+    (void)f;
     }
 #if TEST_STD_VER >= 11
     {
     constexpr std::once_flag f;
+    (void)f;
     }
 #endif
 }