diff --git a/test/thread/thread.mutex/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp b/test/thread/thread.mutex/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp
index 292673c1..00d69b6f 100644
--- a/test/thread/thread.mutex/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp
+++ b/test/thread/thread.mutex/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp
@@ -36,7 +36,7 @@ void f1()
     m.unlock();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(5000000));  // within 5ms
+    assert(d < ns(50000000));  // within 50ms
 }
 
 void f2()
@@ -45,7 +45,7 @@ void f2()
     assert(m.try_lock_for(ms(250)) == false);
     time_point t1 = Clock::now();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(5000000));  // within 5ms
+    assert(d < ns(50000000));  // within 50ms
 }
 
 int main()