diff --git a/apps/red-ui/src/app/modules/admin/dialogs/add-edit-dictionary-dialog/add-edit-dictionary-dialog.component.ts b/apps/red-ui/src/app/modules/admin/dialogs/add-edit-dictionary-dialog/add-edit-dictionary-dialog.component.ts
index 737d96915..a4972d383 100644
--- a/apps/red-ui/src/app/modules/admin/dialogs/add-edit-dictionary-dialog/add-edit-dictionary-dialog.component.ts
+++ b/apps/red-ui/src/app/modules/admin/dialogs/add-edit-dictionary-dialog/add-edit-dictionary-dialog.component.ts
@@ -130,7 +130,7 @@ export class AddEditDictionaryDialogComponent extends BaseDialogComponent {
         let technicalName = baseTechnicalName;
         let suffix = 1;
         while (existingTechnicalNames.includes(technicalName)) {
-            technicalName = [baseTechnicalName, suffix++].join('-');
+            technicalName = [baseTechnicalName, suffix++].join('_');
         }
         return technicalName;
     }