diff --git a/OpenSim/Framework/IClientAPI.cs b/OpenSim/Framework/IClientAPI.cs
index c34fb930d9..62a97e57b2 100644
--- a/OpenSim/Framework/IClientAPI.cs
+++ b/OpenSim/Framework/IClientAPI.cs
@@ -229,7 +229,7 @@ namespace OpenSim.Framework
     public delegate void RezObject(IClientAPI remoteClient, LLUUID itemID, LLVector3 pos);
 
     public delegate void ModifyTerrain(
-        float height, float seconds, byte size, byte action, float north, float west, IClientAPI remoteClient);
+        float height, float seconds, byte size, byte action, float north, float west, float south, float east, IClientAPI remoteClient);
 
     public delegate void SetAppearance(byte[] texture, AgentSetAppearancePacket.VisualParamBlock[] visualParam);
 
diff --git a/OpenSim/Region/ClientStack/ClientView.cs b/OpenSim/Region/ClientStack/ClientView.cs
index dffcd7338d..065e5e011a 100644
--- a/OpenSim/Region/ClientStack/ClientView.cs
+++ b/OpenSim/Region/ClientStack/ClientView.cs
@@ -2453,10 +2453,13 @@ namespace OpenSim.Region.ClientStack
                         {
                             if (OnModifyTerrain != null)
                             {
-                                OnModifyTerrain(modify.ModifyBlock.Height, modify.ModifyBlock.Seconds,
-                                                modify.ModifyBlock.BrushSize,
-                                                modify.ModifyBlock.Action, modify.ParcelData[0].North,
-                                                modify.ParcelData[0].West, this);
+                                for (int i=0; i < modify.ParcelData.Length; i++)
+                                {
+                                    OnModifyTerrain(modify.ModifyBlock.Height, modify.ModifyBlock.Seconds,
+                                                    modify.ModifyBlock.BrushSize,
+                                                    modify.ModifyBlock.Action, modify.ParcelData[i].North,
+                                                    modify.ParcelData[i].West, modify.ParcelData[i].South, modify.ParcelData[i].East, this);
+                                }
                             }
                         }
                         break;
diff --git a/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs b/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs
index 07e5362e40..ce775278b6 100644
--- a/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs
+++ b/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs
@@ -45,7 +45,7 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="action">The action to be performed</param>
         /// <param name="north">Distance from the north border where the cursor is located</param>
         /// <param name="west">Distance from the west border where the cursor is located</param>
-        public void ModifyTerrain(float height, float seconds, byte brushsize, byte action, float north, float west,
+        public void ModifyTerrain(float height, float seconds, byte brushsize, byte action, float north, float west, float south, float east,
                                   IClientAPI remoteUser)
         {
             // Do a permissions check before allowing terraforming.