diff --git a/packages/backend/src/server/api/endpoints/notes/translate.ts b/packages/backend/src/server/api/endpoints/notes/translate.ts
index c602981b30..5e40e7106f 100644
--- a/packages/backend/src/server/api/endpoints/notes/translate.ts
+++ b/packages/backend/src/server/api/endpoints/notes/translate.ts
@@ -1,12 +1,12 @@
-import define from '../../define.js';
-import { getNote } from '../../common/getters.js';
-import { ApiError } from '../../error.js';
+import { URLSearchParams } from 'node:url';
 import fetch from 'node-fetch';
 import config from '@/config/index.js';
 import { getAgentByUrl } from '@/misc/fetch.js';
-import { URLSearchParams } from 'node:url';
 import { fetchMeta } from '@/misc/fetch-meta.js';
 import { Notes } from '@/models/index.js';
+import { ApiError } from '../../error.js';
+import { getNote } from '../../common/getters.js';
+import define from '../../define.js';
 
 export const meta = {
 	tags: ['notes'],
@@ -80,7 +80,12 @@ export default define(meta, paramDef, async (ps, user) => {
 		agent: getAgentByUrl,
 	});
 
-	const json = await res.json();
+	const json = (await res.json()) as {
+		translations: {
+			detected_source_language: string;
+			text: string;
+		}[];
+	};
 
 	return {
 		sourceLang: json.translations[0].detected_source_language,