diff --git a/engine/src/terrain/com/jme3/terrain/geomipmap/TerrainQuad.java b/engine/src/terrain/com/jme3/terrain/geomipmap/TerrainQuad.java
index ad7baecad..71a894f73 100644
--- a/engine/src/terrain/com/jme3/terrain/geomipmap/TerrainQuad.java
+++ b/engine/src/terrain/com/jme3/terrain/geomipmap/TerrainQuad.java
@@ -1066,8 +1066,8 @@ public class TerrainQuad extends Node implements Terrain {
 
     public Vector3f getNormal(Vector2f xz) {
         // offset
-        float x = (float)(((xz.x - getWorldTranslation().x) / getWorldScale().x) + (float)totalSize / 2f);
-        float z = (float)(((xz.y - getWorldTranslation().z) / getWorldScale().z) + (float)totalSize / 2f);
+        float x = (float)(((xz.x - getWorldTranslation().x) / getWorldScale().x) + (float)(totalSize-1) / 2f);
+        float z = (float)(((xz.y - getWorldTranslation().z) / getWorldScale().z) + (float)(totalSize-1) / 2f);
         Vector3f normal = getNormal(x, z, xz);
         
         return normal;