src/java.base/share/classes/java/time/zone/Ser.java

@@ -95,10 +95,11 @@
     static final byte ZOTRULE = 3;
 
     /** The type being serialized. */
     private byte type;
     /** The object being serialized. */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Object object;
 
     /**
      * Constructor for deserialization.
      */