diff --git a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/CollectionProxy.java b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/CollectionProxy.java
index 64ba99e886..8fa4609d8f 100644
--- a/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/CollectionProxy.java
+++ b/envers/src/main/java/org/hibernate/envers/entities/mapper/relation/lazy/proxy/CollectionProxy.java
@@ -35,6 +35,9 @@ public abstract class CollectionProxy<U, T extends Collection<U>> implements Col
     private org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor<T> initializor;
     protected T delegate;
 
+    protected CollectionProxy() {
+    }
+
     public CollectionProxy(Initializor<T> initializor) {
         this.initializor = initializor;
     }
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 31954676d7..0352c01205 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
@@ -23,6 +23,8 @@
  */
 package org.hibernate.envers.entities.mapper.relation.lazy.proxy;
 
+import org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor;
+
 import java.util.Collection;
 import java.util.List;
 import java.util.ListIterator;
@@ -34,6 +36,9 @@ import java.io.Serializable;
 public class ListProxy<U> extends CollectionProxy<U, List<U>> implements List<U>, Serializable {
     private static final long serialVersionUID = -5479232938279790987L;
 
+    public ListProxy() {
+    }
+
     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 39fc532703..92d90dab06 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
@@ -39,6 +39,9 @@ public class MapProxy<K, V> implements Map<K, V>, Serializable {
     private Initializor<Map<K, V>> initializor;
     protected Map<K, V> delegate;
 
+    public MapProxy() {
+    }
+
     public MapProxy(org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor<Map<K, V>> initializor) {
         this.initializor = initializor;
     }
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 9959629e4c..7eb0bf3b2d 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
@@ -32,6 +32,9 @@ import java.io.Serializable;
 public class SetProxy<U> extends CollectionProxy<U, Set<U>> implements Set<U>, Serializable {
     private static final long serialVersionUID = 131464133074137701L;
 
+    public SetProxy() {
+    }
+
     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 b6359cba23..6a794589b1 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
@@ -41,6 +41,9 @@ public class SortedMapProxy<K, V> implements SortedMap<K, V>, Serializable {
     private Initializor<SortedMap<K, V>> initializor;
     protected SortedMap<K, V> delegate;
 
+    public SortedMapProxy() {
+    }
+
     public SortedMapProxy(org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor<SortedMap<K, V>> initializor) {
         this.initializor = initializor;
     }
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 2fc92fdbe9..007b7b3128 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
@@ -33,6 +33,9 @@ import java.io.Serializable;
 public class SortedSetProxy<U> extends CollectionProxy<U, SortedSet<U>> implements SortedSet<U>, Serializable {
     private static final long serialVersionUID = 2092884107178125905L;
 
+    public SortedSetProxy() {
+    }
+
     public SortedSetProxy(org.hibernate.envers.entities.mapper.relation.lazy.initializor.Initializor<SortedSet<U>> initializor) {
         super(initializor);
     }