diff --git a/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java b/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java
index b7f3e110..b8cd3522 100644
--- a/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java
+++ b/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java
@@ -27,6 +27,7 @@ import org.hibernate.criterion.Junction;
 import org.hibernate.criterion.Order;
 import org.hibernate.Criteria;
 
+import java.io.IOException;
 import java.util.List;
 import java.util.Calendar;
 
@@ -234,10 +235,10 @@ public class MindmapManagerImpl
         getHibernateTemplate().delete(mindMap);
     }
 
-    private void saveHistory(@NotNull final Mindmap mindMap) {
+    private void saveHistory(@NotNull final Mindmap mindMap) throws IOException {
         final MindMapHistory history = new MindMapHistory();
 
-        history.setXml(mindMap.getXml());
+        history.setZippedXml(mindMap.getZippedXml());
         history.setCreationTime(Calendar.getInstance());
         history.setEditor(mindMap.getLastEditor());
         history.setMindmapId(mindMap.getId());
diff --git a/wise-webapp/src/main/java/com/wisemapping/model/MindMapHistory.java b/wise-webapp/src/main/java/com/wisemapping/model/MindMapHistory.java
index c6b6f319..d33c9be3 100755
--- a/wise-webapp/src/main/java/com/wisemapping/model/MindMapHistory.java
+++ b/wise-webapp/src/main/java/com/wisemapping/model/MindMapHistory.java
@@ -29,7 +29,7 @@ public class MindMapHistory {
     private int id;
     private Calendar creationTime;
     private User editor;
-    private byte[] xml;
+    private byte[] zippedXml;
     private int mindmapId;
 
     public MindMapHistory() {
@@ -69,15 +69,15 @@ public class MindMapHistory {
         this.editor = editor;
     }
 
-    public byte[] getXml() {
-        return xml;
+    public byte[] getZippedXml() {
+        return zippedXml;
     }
 
-    public void setXml(byte[] value) {
-        xml = value;
+    public void setZippedXml(byte[] value) {
+        zippedXml = value;
     }
 
     public byte[] getUnzipXml() throws IOException {
-        return ZipUtils.zipToBytes(getXml());
+        return ZipUtils.zipToBytes(getZippedXml());
     }
 }
diff --git a/wise-webapp/src/main/java/com/wisemapping/rest/MindmapController.java b/wise-webapp/src/main/java/com/wisemapping/rest/MindmapController.java
index 757d5396..87044cfa 100644
--- a/wise-webapp/src/main/java/com/wisemapping/rest/MindmapController.java
+++ b/wise-webapp/src/main/java/com/wisemapping/rest/MindmapController.java
@@ -172,7 +172,7 @@ public class MindmapController extends BaseController {
             List<MindMapHistory> mindmapHistory = mindmapService.findMindmapHistory(id);
             if (mindmapHistory.size() > 0) {
                 final MindMapHistory mindMapHistory = mindmapHistory.get(0);
-                mindmap.setZippedXml(mindMapHistory.getXml());
+                mindmap.setZippedXml(mindMapHistory.getZippedXml());
                 saveMindmapDocument(true, mindmap, user);
             }
         } else {
diff --git a/wise-webapp/src/main/java/com/wisemapping/service/MindmapServiceImpl.java b/wise-webapp/src/main/java/com/wisemapping/service/MindmapServiceImpl.java
index 70b2a83b..f624a324 100755
--- a/wise-webapp/src/main/java/com/wisemapping/service/MindmapServiceImpl.java
+++ b/wise-webapp/src/main/java/com/wisemapping/service/MindmapServiceImpl.java
@@ -263,7 +263,7 @@ public class MindmapServiceImpl
     public void revertChange(@NotNull Mindmap mindmap, int historyId)
             throws WiseMappingException, IOException {
         final MindMapHistory history = mindmapManager.getHistory(historyId);
-        mindmap.setZippedXml(history.getXml());
+        mindmap.setZippedXml(history.getZippedXml());
         updateMindmap(mindmap, true);
     }
 
diff --git a/wise-webapp/src/main/resources/com/wisemapping/model/MindMapHistory.hbm.xml b/wise-webapp/src/main/resources/com/wisemapping/model/MindMapHistory.hbm.xml
index 29e9e836..cf83813a 100755
--- a/wise-webapp/src/main/resources/com/wisemapping/model/MindMapHistory.hbm.xml
+++ b/wise-webapp/src/main/resources/com/wisemapping/model/MindMapHistory.hbm.xml
@@ -11,7 +11,7 @@
         </id>
 
         <property name="mindmapId" column="mindmap_id"/>
-        <property name="xml" column="xml"/>
+        <property name="getZippedXml" column="xml"/>
         <property name="creationTime" column="creation_date"/>
         <many-to-one name="editor" column="editor_id" unique="false" not-null="false" lazy="proxy"/>
     </class>