--- old/src/java.base/share/classes/java/lang/AssertionError.java	2019-08-27 17:27:01.666324386 -0700
+++ new/src/java.base/share/classes/java/lang/AssertionError.java	2019-08-27 17:27:01.494324386 -0700
@@ -41,6 +41,7 @@
  * @since   1.4
  */
 public class AssertionError extends Error {
+    @java.io.Serial
     private static final long serialVersionUID = -5013299493970297370L;
 
     /**