diff --git a/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs b/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
index 0593077044..7f60ae2a14 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
@@ -102,6 +102,7 @@ namespace OpenSim.Region.Terrain
             w = 256;
             h = 256;
             heightmap = new Channel(w, h);
+            revertmap = new Channel(w, h);
 
             offsetX = X;
             offsetY = Y;