--- old/src/java.base/share/classes/java/util/LinkedHashSet.java	2019-08-27 17:29:05.898324386 -0700
+++ new/src/java.base/share/classes/java/util/LinkedHashSet.java	2019-08-27 17:29:05.726324386 -0700
@@ -119,6 +119,7 @@
     extends HashSet<E>
     implements Set<E>, Cloneable, java.io.Serializable {
 
+    @java.io.Serial
     private static final long serialVersionUID = -2851667679971038690L;
 
     /**