diff --git a/Polyhedron/demo/Polyhedron/Plugins/PCA/Basic_generator_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/PCA/Basic_generator_plugin.cpp
index 269eb121ae4..4d92aeb7867 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PCA/Basic_generator_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/PCA/Basic_generator_plugin.cpp
@@ -766,7 +766,7 @@ struct Point_generator
   {
     return Point(bl.x() + i*(ur.x()-bl.x())/(w-1),
                  bl.y() + j*(ur.y()-bl.y())/(h-1),
-                 0);
+                 bl.z() + j*(ur.z()-bl.z())/(h-1));
   }
 };
 template<class Facegraph_item>