diff --git a/Common/Options.cpp b/Common/Options.cpp
index 5d61e8d0fcc0d9d5dc4363aaf5f0f27846536800..854257eb661be39afdec5105780f299f186df244 100644
--- a/Common/Options.cpp
+++ b/Common/Options.cpp
@@ -5955,20 +5955,23 @@ double opt_mesh_algo3d(OPT_ARGS_NUM)
 #if defined(HAVE_FLTK)
   if(FlGui::available() && (action & GMSH_GUI)) {
     switch (CTX::instance()->mesh.algo3d) {
+    case ALGO_3D_RTREE:
+      FlGui::instance()->options->mesh.choice[3]->value(6);
+      break;
     case ALGO_3D_MMG3D:
-      FlGui::instance()->options->mesh.choice[3]->value(4);
+      FlGui::instance()->options->mesh.choice[3]->value(5);
       break;
     case ALGO_3D_FRONTAL_HEX:
-      FlGui::instance()->options->mesh.choice[3]->value(3);
+      FlGui::instance()->options->mesh.choice[3]->value(4);
       break;
     case ALGO_3D_FRONTAL_DEL:
-      FlGui::instance()->options->mesh.choice[3]->value(2);
+      FlGui::instance()->options->mesh.choice[3]->value(3);
       break;
     case ALGO_3D_FRONTAL:
-      FlGui::instance()->options->mesh.choice[3]->value(1);
+      FlGui::instance()->options->mesh.choice[3]->value(2);
       break;
-    case ALGO_3D_RTREE:
-      FlGui::instance()->options->mesh.choice[3]->value(5);
+    case ALGO_3D_DELAUNAY_NEW:
+      FlGui::instance()->options->mesh.choice[3]->value(1);
       break;
     case ALGO_3D_DELAUNAY:
     default:
diff --git a/Fltk/optionWindow.cpp b/Fltk/optionWindow.cpp
index 964a3c22153d135bc6a4317c5eb804260c695a78..87845be4edb61065ed70ca540cdfe5c700500de2 100644
--- a/Fltk/optionWindow.cpp
+++ b/Fltk/optionWindow.cpp
@@ -533,12 +533,13 @@ static void mesh_options_ok_cb(Fl_Widget *w, void *data)
                   (o->mesh.choice[2]->value() == 5) ? ALGO_2D_PACK_PRLGRMS :
                   ALGO_2D_AUTO);
   opt_mesh_algo3d(0, GMSH_SET,
-                  (o->mesh.choice[3]->value() == 0) ? ALGO_3D_DELAUNAY :
-                  (o->mesh.choice[3]->value() == 2) ? ALGO_3D_FRONTAL_DEL :
-                  (o->mesh.choice[3]->value() == 3) ? ALGO_3D_FRONTAL_HEX :
-                  (o->mesh.choice[3]->value() == 4) ? ALGO_3D_MMG3D :
-                  (o->mesh.choice[3]->value() == 5) ? ALGO_3D_RTREE :
-                  ALGO_3D_FRONTAL);
+                  (o->mesh.choice[3]->value() == 1) ? ALGO_3D_DELAUNAY_NEW :
+                  (o->mesh.choice[3]->value() == 2) ? ALGO_3D_FRONTAL :
+                  (o->mesh.choice[3]->value() == 3) ? ALGO_3D_FRONTAL_DEL :
+                  (o->mesh.choice[3]->value() == 4) ? ALGO_3D_FRONTAL_HEX :
+                  (o->mesh.choice[3]->value() == 5) ? ALGO_3D_MMG3D :
+                  (o->mesh.choice[3]->value() == 6) ? ALGO_3D_RTREE :
+                  ALGO_3D_DELAUNAY);
   opt_mesh_algo_recombine(0, GMSH_SET, o->mesh.choice[1]->value());
   opt_mesh_recombine_all(0, GMSH_SET, o->mesh.butt[21]->value());
 
@@ -2237,6 +2238,7 @@ optionWindow::optionWindow(int deltaFontSize)
       };
       static Fl_Menu_Item menu_3d_algo[] = {
         {"Delaunay", 0, 0, 0},
+        {"New Delaunay", 0, 0, 0},
         {"Frontal", 0, 0, 0},
         {"Frontal Delaunay (experimental)", 0, 0, 0},
         {"Frontal Hex (experimental)", 0, 0, 0},