--- old/make/jdk/src/classes/build/tools/tzdb/TzdbZoneRulesCompiler.java	2019-07-24 15:18:17.000000000 -0700
+++ new/make/jdk/src/classes/build/tools/tzdb/TzdbZoneRulesCompiler.java	2019-07-24 15:18:17.000000000 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -264,7 +264,7 @@
             for (ZoneRules rules : rulesList) {
                 baos.reset();
                 DataOutputStream dataos = new DataOutputStream(baos);
-                rules.writeExternal(dataos);
+                Ser.write(rules, dataos);
                 dataos.close();
                 byte[] bytes = baos.toByteArray();
                 out.writeShort(bytes.length);