--- old/src/java.base/share/classes/java/util/TimeZone.java	2019-08-27 17:29:13.326324386 -0700
+++ new/src/java.base/share/classes/java/util/TimeZone.java	2019-08-27 17:29:13.130324386 -0700
@@ -160,6 +160,7 @@
     private static final int ONE_DAY    = 24*ONE_HOUR;
 
     // Proclaim serialization compatibility with JDK 1.1
+    @java.io.Serial
     static final long serialVersionUID = 3581463369166924961L;
 
     /**