diff --git a/src/frontend/app/indexation/indexing-form/indexing-form.component.ts b/src/frontend/app/indexation/indexing-form/indexing-form.component.ts
index a4ad0adbc92e7b9daa1767b9df400ba126fa00af..e76589c813c1523537292c44e3f0e186d64246ee 100755
--- a/src/frontend/app/indexation/indexing-form/indexing-form.component.ts
+++ b/src/frontend/app/indexation/indexing-form/indexing-form.component.ts
@@ -1298,6 +1298,7 @@ export class IndexingFormComponent implements OnInit {
                     if (this.functions.empty(item.unit)) {
                         item.unit = 'mail';
                     }
+                    item.mandatory = true;
                     this.initValidator(item);
                 }
             });