diff --git a/Libraries/Opc.Ua.Server/Diagnostics/CustomNodeManager.cs b/Libraries/Opc.Ua.Server/Diagnostics/CustomNodeManager.cs
index bd6663d1f..f2b8b7b83 100644
--- a/Libraries/Opc.Ua.Server/Diagnostics/CustomNodeManager.cs
+++ b/Libraries/Opc.Ua.Server/Diagnostics/CustomNodeManager.cs
@@ -102,10 +102,6 @@ protected CustomNodeManager2(
                 }
             }
 
-            // create the table of monitored items.
-            // these are items created by clients when they subscribe to data or events.
-            m_monitoredItems = new Dictionary<uint, IDataChangeMonitoredItem>();
-
             // create the table of monitored nodes.
             // these are created by the node manager whenever a client subscribe to an attribute of the node.
             m_monitoredNodes = new Dictionary<NodeId, MonitoredNode2>();
@@ -237,14 +233,6 @@ protected List<NodeState> RootNotifiers
             get { return m_rootNotifiers; }
         }
 
-        /// <summary>
-        /// Gets the table of monitored items.
-        /// </summary>
-        protected Dictionary<uint, IDataChangeMonitoredItem> MonitoredItems
-        {
-            get { return m_monitoredItems; }
-        }
-
         /// <summary>
         /// Gets the table of nodes being monitored.
         /// </summary>
@@ -3706,7 +3694,6 @@ protected virtual ServiceResult CreateMonitoredItem(
             monitoredItem = datachangeItem;
 
             // save the monitored item.
-            m_monitoredItems.Add(monitoredItemId, datachangeItem);
             monitoredNode.Add(datachangeItem);
 
             // report change.
@@ -4259,9 +4246,6 @@ protected virtual ServiceResult DeleteMonitoredItem(
                 }
             }
 
-            // remove the monitored item.
-            m_monitoredItems.Remove(monitoredItem.Id);
-
             // report change.
             OnMonitoredItemDeleted(context, handle, datachangeItem);
 
@@ -4777,7 +4761,6 @@ protected NodeState AddNodeToComponentCache(ISystemContext context, NodeHandle h
         private ServerSystemContext m_systemContext;
         private string[] m_namespaceUris;
         private ushort[] m_namespaceIndexes;
-        private Dictionary<uint, IDataChangeMonitoredItem> m_monitoredItems;
         private Dictionary<NodeId, MonitoredNode2> m_monitoredNodes;
         private Dictionary<NodeId, CacheEntry> m_componentCache;
         private NodeIdDictionary<NodeState> m_predefinedNodes;