diff --git a/backend/internal/infrastructure/database/task_repository.go b/backend/internal/infrastructure/database/task_repository.go
index 34bd335..205a73e 100644
--- a/backend/internal/infrastructure/database/task_repository.go
+++ b/backend/internal/infrastructure/database/task_repository.go
@@ -196,8 +196,7 @@ func (r *TaskListRepository) DeleteTaskListsBySpaceID(ctx context.Context, space
 
 func (r *TaskListRepository) EnsureIndexes(ctx context.Context) error {
 	_, err := r.collection.Indexes().CreateMany(ctx, []mongo.IndexModel{
-		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "name", Value: 1}}, Options: options.Index().SetUnique(true)},
-		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "category_id", Value: 1}}},
+		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "category_id", Value: 1}, {Key: "name", Value: 1}}, Options: options.Index().SetUnique(true)},
 	})
 	return err
 }