src/java.base/share/classes/java/util/LinkedHashSet.java

@@ -117,10 +117,11 @@
 
 public class LinkedHashSet<E>
     extends HashSet<E>
     implements Set<E>, Cloneable, java.io.Serializable {
 
+    @java.io.Serial
     private static final long serialVersionUID = -2851667679971038690L;
 
     /**
      * Constructs a new, empty linked hash set with the specified initial
      * capacity and load factor.