diff --git a/OpenSim/Framework/UndoStack.cs b/OpenSim/Framework/UndoStack.cs
deleted file mode 100644
index 8f8849de5b..0000000000
--- a/OpenSim/Framework/UndoStack.cs
+++ /dev/null
@@ -1,152 +0,0 @@
-/*
- * Copyright (c) Contributors, http://opensimulator.org/
- * See CONTRIBUTORS.TXT for a full list of copyright holders.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in the
- *       documentation and/or other materials provided with the distribution.
- *     * Neither the name of the OpenSimulator Project nor the
- *       names of its contributors may be used to endorse or promote products
- *       derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-using System;
-
-namespace OpenSim.Framework
-{
-    /// <summary>
-    /// Undo stack.  Deletes entries beyond a certain capacity
-    /// </summary>
-    /// <typeparam name="T"></typeparam>
-    [Serializable]
-    public class UndoStack<T>
-    {
-        private int m_new = 1;
-        private int m_old = 0;
-        private T[] m_Undos;
-
-        public UndoStack(int capacity)
-        {
-            m_Undos = new T[capacity + 1];
-        }
-
-        /// <summary>
-        /// Is the stack full?
-        /// </summary>
-        public bool IsFull
-        {
-            get
-            {
-                // If the old and new pointers are in the same place then all stack slots are occupied.
-                return m_new == m_old;
-            }
-        }
-
-        /// <summary>
-        /// Capacity of the stack.
-        /// </summary>
-        public int Capacity
-        {
-            get { return m_Undos.Length - 1; }
-        }
-
-        /// <summary>
-        /// Return the number of undos on the stack.
-        /// </summary>
-        public int Count
-        {
-            get
-            {
-                int count = m_new - m_old - 1;
-
-                if (count < 0)
-                    count += m_Undos.Length;
-
-                return count;
-            }
-        }
-
-        /// <summary>
-        /// Push a new undo onto the stack.
-        /// </summary>
-        /// <param name="item"></param>
-        public void Push(T item)
-        {
-            if (IsFull)
-            {
-                m_old++;
-
-                if (m_old >= m_Undos.Length)
-                    m_old -= m_Undos.Length;
-            }
-
-            if (++m_new >= m_Undos.Length)
-                m_new -= m_Undos.Length;
-
-            m_Undos[m_new] = item;
-        }
-
-        /// <summary>
-        /// Pop and item from the top of the undo stack.
-        /// </summary>
-        /// <returns></returns>
-        public T Pop()
-        {
-            if (Count > 0)
-            {
-                T deleted = m_Undos[m_new];
-                m_Undos[m_new--] = default(T);
-
-                if (m_new < 0)
-                    m_new += m_Undos.Length;
-
-                return deleted;
-            }
-            else
-            {
-                throw new InvalidOperationException("Cannot pop from empty stack");
-            }
-        }
-
-        /// <summary>
-        /// Peek at the undo on the top of the stack.
-        /// </summary>
-        /// <returns></returns>
-        public T Peek()
-        {
-            return m_Undos[m_new];
-        }
-
-        /// <summary>
-        /// Clear the stack.
-        /// </summary>
-        public void Clear()
-        {
-            if (Count > 0)
-            {
-                for (int i = 0; i < m_Undos.Length; i++)
-                {
-                    m_Undos[i] = default(T);
-                }
-
-                m_new = 1;
-                m_old = 0;
-            }
-        }
-    }
-}
diff --git a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
index 9c7b2fab9c..c8325201e6 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
@@ -84,7 +84,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         private ITerrainChannel m_revert;
         private Scene m_scene;
         private volatile bool m_tainted;
-        private readonly UndoStack<LandUndoState> m_undo = new UndoStack<LandUndoState>(5);
+        private readonly Stack<LandUndoState> m_undo = new Stack<LandUndoState>(5);
 
         #region ICommandableModule Members