--- old/src/java.base/share/classes/java/time/Ser.java	2019-09-18 13:11:07.290992999 -0700
+++ new/src/java.base/share/classes/java/time/Ser.java	2019-09-18 13:11:07.019128999 -0700
@@ -112,6 +112,7 @@
     /** The type being serialized. */
     private byte type;
     /** The object being serialized. */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Object object;
 
     /**