diff --git a/src/app/formulaire/definition/concrete/form-grille.ts b/src/app/formulaire/definition/concrete/form-grille.ts
index ea732cd96db4b4e521ceb6b4e8911836fe0ac633..fb7bc524df01e1a99300ab5aa19de793fe58c52c 100644
--- a/src/app/formulaire/definition/concrete/form-grille.ts
+++ b/src/app/formulaire/definition/concrete/form-grille.ts
@@ -56,6 +56,8 @@ export class FormulaireGrille extends FormulaireBase {
                 this.reset();
                 // Inclined grids have more input fields (OEntH and cIncl)
                 this.getFieldsetById("fs_grille").updateFields();
+                // Alpha and Beta are not always shown
+                this.getFieldsetById("fs_plan").updateFields();
             }
         }
     }