diff --git a/tests/pass/concurrency/sync.rs b/tests/pass/concurrency/sync.rs
index 1d48e5312d..6091507272 100644
--- a/tests/pass/concurrency/sync.rs
+++ b/tests/pass/concurrency/sync.rs
@@ -79,7 +79,7 @@ fn check_conditional_variables_timed_wait_notimeout() {
     let guard = lock.lock().unwrap();
 
     let handle = thread::spawn(move || {
-        thread::sleep(Duration::from_millis(100)); // Make sure the other thread is waiting by the time we call `notify`.
+        thread::sleep(Duration::from_millis(10)); // Make sure the other thread is waiting by the time we call `notify`.
         let (_lock, cvar) = &*pair2;
         cvar.notify_one();
     });