diff --git a/packages/backend/src/server/api/define.ts b/packages/backend/src/server/api/define.ts
index e2a34f47a..41978efe8 100644
--- a/packages/backend/src/server/api/define.ts
+++ b/packages/backend/src/server/api/define.ts
@@ -6,7 +6,7 @@ import { ApiError } from './error';
 import { Schema, SchemaType } from '@/misc/schema';
 import { AccessToken } from '@/models/entities/access-token';
 import { ValidateFunction } from 'ajv';
-import { JTDDataType } from 'ajv/dist/types/jtd-schema';
+import { JTDDataType } from 'ajv/dist/core';
 import { apiLogger } from './logger';
 
 type SimpleUserInfo = {