diff --git a/packages/hydrooj/src/model/schedule.ts b/packages/hydrooj/src/model/schedule.ts
index c002a15ba..3d14f32bc 100644
--- a/packages/hydrooj/src/model/schedule.ts
+++ b/packages/hydrooj/src/model/schedule.ts
@@ -5,9 +5,9 @@ import { STATUS } from '@hydrooj/utils/lib/status';
 import { Context } from '../context';
 import { Schedule } from '../interface';
 import { Logger } from '../logger';
-import { ContestModel, DocumentModel } from '../plugin-api';
 import db from '../service/db';
 import type { WorkerService } from '../service/worker';
+import * as DocumentModel from './document';
 import RecordModel from './record';
 
 const logger = new Logger('model/schedule');