diff --git a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp
index 0e19e5925eeb..36428bc7fc50 100644
--- a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp
+++ b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp
@@ -44,9 +44,9 @@ void helper() {
 int main(int, char**)
 {
   notReady = threadCount;
-  std::vector<std::thread> threads;
+  std::vector<std::thread> threads(threadCount);
   for (unsigned i = 0; i < threadCount; i++)
-    threads.emplace_back(helper);
+    threads[i] = std::thread(helper);
   {
     while (notReady > 0)
       std::this_thread::yield();