diff --git a/GraphicsView/include/CGAL/Qt/camera.h b/GraphicsView/include/CGAL/Qt/camera.h
index 8b4ed1d2e00..08f76d4eb0b 100644
--- a/GraphicsView/include/CGAL/Qt/camera.h
+++ b/GraphicsView/include/CGAL/Qt/camera.h
@@ -475,7 +475,7 @@ inline void read_pixel(const QPoint &pixel, QOpenGLFunctions *p,
                         GLvoid *pixel_data) {
   const auto pixel_ratio = camera->devicePixelRatio();
   p->glReadPixels(pixel.x() * pixel_ratio,
-                  (camera->screenHeight() - 1 - pixel.y()) * pixel_ratio, 1, 1,
+                  (camera->screenHeight() - pixel.y()) * pixel_ratio - 1, 1, 1,
                   format, type, pixel_data);
 }
 
diff --git a/Polyhedron/demo/Polyhedron/Scene.cpp b/Polyhedron/demo/Polyhedron/Scene.cpp
index 065d3f9e8d8..f7b5846dc51 100644
--- a/Polyhedron/demo/Polyhedron/Scene.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene.cpp
@@ -563,9 +563,8 @@ void Scene::renderScene(const QList<Scene_interface::Item_id> &items,
         if(with_names) {
 
           //    read depth buffer at pick location;
-          float depth = 1.0;
-          depth = read_depth_under_pixel(picked_pixel, viewer, viewer->camera());
-          if (depth != 1.0)
+          float depth = read_depth_under_pixel(picked_pixel, viewer, viewer->camera());
+          if (depth < 2.0)
           {
             //add object to list of picked objects;
             picked_item_IDs[depth] = index;