diff --git a/examples/osgshaderterrain/osgshaderterrain.cpp b/examples/osgshaderterrain/osgshaderterrain.cpp
index 6ee3b8289..6a20aff43 100644
--- a/examples/osgshaderterrain/osgshaderterrain.cpp
+++ b/examples/osgshaderterrain/osgshaderterrain.cpp
@@ -579,8 +579,8 @@ osg::Node* ForestTechniqueManager::createScene(unsigned int /*numTreesToCreates*
                "    vec4 position;\n"
                "    position.x = gl_Vertex.x;\n"
                "    position.y = gl_Vertex.y;\n"
-               "    float zscale = 0.99;\n"
-               "    position.z = texture2D(terrainTexture, texcoord).r * zscale;\n"
+               "    position.z = texture2D(terrainTexture, texcoord).r;\n"
+               "    position.w = 1.0;\n"
                " \n"
                "    gl_Position     = gl_ModelViewProjectionMatrix * position;\n"
                 "   gl_FrontColor = vec4(1.0,1.0,1.0,1.0);\n"