diff --git a/src/main/java/com/googlesource/gerrit/plugins/batch/exception/NoSuchBatchException.java b/src/main/java/com/googlesource/gerrit/plugins/batch/exception/NoSuchBatchException.java
index babe9db..674fe83 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/batch/exception/NoSuchBatchException.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/batch/exception/NoSuchBatchException.java
@@ -15,6 +15,8 @@
 package com.googlesource.gerrit.plugins.batch.exception;
 
 public class NoSuchBatchException extends Exception {
+  private static final long serialVersionUID = 1L;
+
   public NoSuchBatchException(String id) {
     super("No such batch: " + id);
   }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/batch/ssh/MergeChangeCommand.java b/src/main/java/com/googlesource/gerrit/plugins/batch/ssh/MergeChangeCommand.java
index b25e110..932b000 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/batch/ssh/MergeChangeCommand.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/batch/ssh/MergeChangeCommand.java
@@ -191,6 +191,8 @@
    */
   protected class Resolver {
     protected class ParentsNotOnBranchException extends Exception {
+      private static final long serialVersionUID = 1L;
+
       protected ParentsNotOnBranchException(PatchSetArgument psarg) {
         super(
             "No Parent of "