diff --git a/db/schema.sql b/db/schema.sql
index 7aaea2fbd..937733e4c 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -67,7 +67,7 @@ CREATE INDEX `IDX_sync_sync_date` ON `sync` (
 CREATE INDEX `IDX_notes_is_deleted` ON `notes` (
     `is_deleted`
 );
-CREATE UNIQUE INDEX `IDX_notes_tree_note_id_parent_note_id` ON `notes_tree` (
+CREATE INDEX `IDX_notes_tree_note_id_parent_note_id` ON `notes_tree` (
   `note_id`,
   `parent_note_id`
 );