diff --git a/src/main/java/io/ebeaninternal/server/el/ElComparator.java b/src/main/java/io/ebeaninternal/server/el/ElComparator.java
index 5dcd6ead0..993c9696f 100644
--- a/src/main/java/io/ebeaninternal/server/el/ElComparator.java
+++ b/src/main/java/io/ebeaninternal/server/el/ElComparator.java
@@ -1,11 +1,12 @@
 package io.ebeaninternal.server.el;
 
+import java.io.Serializable;
 import java.util.Comparator;
 
 /**
  * Comparator for use with the expression objects.
  */
-public interface ElComparator<T> extends Comparator<T> {
+public interface ElComparator<T> extends Comparator<T>, Serializable {
 
   /**
    * Compare given 2 beans.
diff --git a/src/main/java/io/ebeaninternal/server/el/ElComparatorCompound.java b/src/main/java/io/ebeaninternal/server/el/ElComparatorCompound.java
index 390de6d61..dc4dd6eeb 100644
--- a/src/main/java/io/ebeaninternal/server/el/ElComparatorCompound.java
+++ b/src/main/java/io/ebeaninternal/server/el/ElComparatorCompound.java
@@ -10,6 +10,8 @@ import java.util.Comparator;
  */
 public final class ElComparatorCompound<T> implements Comparator<T>, ElComparator<T> {
 
+  private static final long serialVersionUID = -1523163475050929750L;
+
   private final ElComparator<T>[] array;
 
   public ElComparatorCompound(ElComparator<T>[] array) {
diff --git a/src/main/java/io/ebeaninternal/server/el/ElComparatorProperty.java b/src/main/java/io/ebeaninternal/server/el/ElComparatorProperty.java
index e142850cc..84f188167 100644
--- a/src/main/java/io/ebeaninternal/server/el/ElComparatorProperty.java
+++ b/src/main/java/io/ebeaninternal/server/el/ElComparatorProperty.java
@@ -7,6 +7,8 @@ import java.util.Comparator;
  */
 public final class ElComparatorProperty<T> implements Comparator<T>, ElComparator<T> {
 
+  private static final long serialVersionUID = -2735738237263956073L;
+
   private final ElPropertyValue elGetValue;
 
   private final int nullOrder;
diff --git a/src/main/java/io/ebeaninternal/server/query/OrderVersionDesc.java b/src/main/java/io/ebeaninternal/server/query/OrderVersionDesc.java
index 2ea46ac3a..e3b99561a 100644
--- a/src/main/java/io/ebeaninternal/server/query/OrderVersionDesc.java
+++ b/src/main/java/io/ebeaninternal/server/query/OrderVersionDesc.java
@@ -2,16 +2,19 @@ package io.ebeaninternal.server.query;
 
 import io.ebean.Version;
 
+import java.io.Serializable;
 import java.sql.Timestamp;
 import java.util.Comparator;
 
 /**
  * Compare Version beans in descending order with nulls last.
  */
-class OrderVersionDesc implements Comparator<Version<?>> {
+class OrderVersionDesc implements Comparator<Version<?>>, Serializable {
 
   static final OrderVersionDesc INSTANCE = new OrderVersionDesc();
 
+  private static final long serialVersionUID = -3681686029998263310L;
+
   @Override
   public int compare(Version<?> o1, Version<?> o2) {