diff --git a/test/zutil/struct/ObjectCacheTest.java b/test/zutil/struct/ObjectCacheTest.java
index 96e64ef..92570be 100755
--- a/test/zutil/struct/ObjectCacheTest.java
+++ b/test/zutil/struct/ObjectCacheTest.java
@@ -62,9 +62,8 @@ public class ObjectCacheTest {
         ObjectCache cache = new ObjectCache(10);
         cache.put(KEY, OBJECT);
         assertEquals(OBJECT, cache.get(KEY));
-        Thread.sleep(1);
         assertTrue(cache.containsKey(KEY));
-        Thread.sleep(10);
+        Thread.sleep(20);
         assertFalse(cache.containsKey(KEY));
         assertEquals(0, cache.size());
     }
diff --git a/test/zutil/struct/TimedHashSetTest.java b/test/zutil/struct/TimedHashSetTest.java
index ced5719..6f8a074 100755
--- a/test/zutil/struct/TimedHashSetTest.java
+++ b/test/zutil/struct/TimedHashSetTest.java
@@ -51,7 +51,7 @@ public class TimedHashSetTest {
         TimedHashSet set = new TimedHashSet(10);
         set.add(ENTRY);
         assertTrue(set.contains(ENTRY));
-        Thread.sleep(15);
+        Thread.sleep(20);
         assertFalse(set.contains(ENTRY));
     }