--- old/src/java.base/share/classes/java/io/IOError.java	2019-08-27 17:26:49.598324386 -0700
+++ new/src/java.base/share/classes/java/io/IOError.java	2019-08-27 17:26:49.414324386 -0700
@@ -46,5 +46,6 @@
         super(cause);
     }
 
+    @java.io.Serial
     private static final long serialVersionUID = 67100927991680413L;
 }