diff --git a/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/RegularImmutableList.java b/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/RegularImmutableList.java
index f82a6b6c780d..a29072f10729 100644
--- a/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/RegularImmutableList.java
+++ b/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/RegularImmutableList.java
@@ -27,6 +27,7 @@
  */
 class RegularImmutableList<E> extends ForwardingImmutableList<E> {
   private final List<E> delegate;
+  E forSerialization;
 
   RegularImmutableList(List<E> delegate) {
     // TODO(cpovirk): avoid redundant unmodifiableList wrapping