1diff --git a/tests/test_redis_lock.py b/tests/test_redis_lock.py
2index ac9e3ef..331ab41 100644
3--- a/tests/test_redis_lock.py
4+++ b/tests/test_redis_lock.py
5@@ -552,7 +552,7 @@ def test_signal_expiration(conn, signal_expire, method):
6 lock.release()
7 elif method == 'reset_all':
8 reset_all(conn)
9- time.sleep(0.5)
10+ time.sleep(0.6)
11 assert conn.exists('lock-signal:signal_expiration')
12 time.sleep((signal_expire - 500) / 1000.0)
13 assert conn.llen('lock-signal:signal_expiration') == 0