diff --git a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/ListProxy.java b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/ListProxy.java
index 39b62da47c..31954676d7 100644
--- a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/ListProxy.java
+++ b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/ListProxy.java
@@ -26,11 +26,14 @@ package org.hibernate.envers.entities.mapper.relation.lazy.proxy;
 import java.util.Collection;
 import java.util.List;
 import java.util.ListIterator;
+import java.io.Serializable;
 
 /**
  * @author Adam Warski (adam at warski dot org)
  */
-public class ListProxy<U> extends CollectionProxy<U, List<U>> implements List<U> {
+public class ListProxy<U> extends CollectionProxy<U, List<U>> implements List<U>, Serializable {
+    private static final long serialVersionUID = -5479232938279790987L;
+
     public ListProxy(org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor<List<U>> initializor) {
         super(initializor);
     }
diff --git a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/MapProxy.java b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/MapProxy.java
index 7eca6e090f..39fc532703 100644
--- a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/MapProxy.java
+++ b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/MapProxy.java
@@ -26,13 +26,16 @@ package org.hibernate.envers.entities.mapper.relation.lazy.proxy;
 import java.util.Collection;
 import java.util.Map;
 import java.util.Set;
+import java.io.Serializable;
 
 import org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor;
 
 /**
  * @author Adam Warski (adam at warski dot org)
  */
-public class MapProxy<K, V> implements Map<K, V> {
+public class MapProxy<K, V> implements Map<K, V>, Serializable {
+    private static final long serialVersionUID = 8418037541773074646L;
+
     private Initializor<Map<K, V>> initializor;
     protected Map<K, V> delegate;
 
diff --git a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SetProxy.java b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SetProxy.java
index 26850785c3..9959629e4c 100644
--- a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SetProxy.java
+++ b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SetProxy.java
@@ -24,11 +24,14 @@
 package org.hibernate.envers.entities.mapper.relation.lazy.proxy;
 
 import java.util.Set;
+import java.io.Serializable;
 
 /**
  * @author Adam Warski (adam at warski dot org)
  */
-public class SetProxy<U> extends CollectionProxy<U, Set<U>> implements Set<U> {
+public class SetProxy<U> extends CollectionProxy<U, Set<U>> implements Set<U>, Serializable {
+    private static final long serialVersionUID = 131464133074137701L;
+
     public SetProxy(org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor<Set<U>> initializor) {
         super(initializor);
     }
diff --git a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedMapProxy.java b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedMapProxy.java
index acbf8c03b5..b6359cba23 100644
--- a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedMapProxy.java
+++ b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedMapProxy.java
@@ -28,13 +28,16 @@ import java.util.Comparator;
 import java.util.Map;
 import java.util.Set;
 import java.util.SortedMap;
+import java.io.Serializable;
 
 import org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor;
 
 /**
  * @author Adam Warski (adam at warski dot org)
  */
-public class SortedMapProxy<K, V> implements SortedMap<K, V> {
+public class SortedMapProxy<K, V> implements SortedMap<K, V>, Serializable {
+    private static final long serialVersionUID = 2645817952901452375L;
+
     private Initializor<SortedMap<K, V>> initializor;
     protected SortedMap<K, V> delegate;
 
diff --git a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedSetProxy.java b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedSetProxy.java
index 7b7a533761..2fc92fdbe9 100644
--- a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedSetProxy.java
+++ b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/SortedSetProxy.java
@@ -25,11 +25,14 @@ package org.hibernate.envers.entities.mapper.relation.lazy.proxy;
 
 import java.util.Comparator;
 import java.util.SortedSet;
+import java.io.Serializable;
 
 /**
  * @author Adam Warski (adam at warski dot org)
  */
-public class SortedSetProxy<U> extends CollectionProxy<U, SortedSet<U>> implements SortedSet<U> {
+public class SortedSetProxy<U> extends CollectionProxy<U, SortedSet<U>> implements SortedSet<U>, Serializable {
+    private static final long serialVersionUID = 2092884107178125905L;
+
     public SortedSetProxy(org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor<SortedSet<U>> initializor) {
         super(initializor);
     }