diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 7763b7291..4e91669bf 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -1,5 +1,5 @@
 import { isSafeInteger, flatten } from 'lodash';
-import yaml, { safeLoad } from 'js-yaml';
+import yaml from 'js-yaml';
 import { ObjectID } from 'mongodb';
 import {
     NoProblemError, ProblemDataNotFoundError, BadRequestError,