diff a/src/hotspot/share/gc/shared/cardTableRS.hpp b/src/hotspot/share/gc/shared/cardTableRS.hpp
--- a/src/hotspot/share/gc/shared/cardTableRS.hpp
+++ b/src/hotspot/share/gc/shared/cardTableRS.hpp
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
@@ -148,11 +148,11 @@
 
   // *** Support for parallel card scanning.
 
   // dirty and precleaned are equivalent wrt younger_refs_iter.
   static bool card_is_dirty_wrt_gen_iter(CardValue cv) {
-    return cv == dirty_card || cv == precleaned_card;
+    return cv == dirty_card;
   }
 
   // Returns "true" iff the value "cv" will cause the card containing it
   // to be scanned in the current traversal.  May be overridden by
   // subtypes.