diff -r 088871daae86 -r e658ae923d53 jdk/src/share/classes/java/util/RegularEnumSet.java
--- a/jdk/src/share/classes/java/util/RegularEnumSet.java	Thu Mar 17 08:55:41 2011 -0700
+++ b/jdk/src/share/classes/java/util/RegularEnumSet.java	Thu Mar 17 13:13:08 2011 -0700
@@ -34,6 +34,7 @@
  * @serial exclude
  */
 class RegularEnumSet<E extends Enum<E>> extends EnumSet<E> {
+    private static final long serialVersionUID = 3411599620347842686L;
     /**
      * Bit vector representation of this set.  The 2^k bit indicates the
      * presence of universe[k] in this set.