diff --git a/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs b/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
index 1e0e978309..bd66c027e2 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
@@ -162,7 +162,7 @@ namespace OpenSim.Region.Terrain
 
             for (i = 0; i < w * h; i++)
             {
-                heights[i] = (float)heightmap.map[i / w, i % w];
+                heights[i] = (float)heightmap.map[i % w, i / w];
             }
 
             return heights;