diff --git a/server/controllers/api/config.ts b/server/controllers/api/config.ts
index 47b91cd94..7ef0c19e3 100644
--- a/server/controllers/api/config.ts
+++ b/server/controllers/api/config.ts
@@ -116,7 +116,7 @@ async function updateCustomConfig (req: express.Request, res: express.Response,
   toUpdateJSON.user['video_quota'] = toUpdate.user.videoQuota
   delete toUpdate.user.videoQuota
 
-  await writeFilePromise(CONFIG.CUSTOM_FILE, JSON.stringify(toUpdateJSON))
+  await writeFilePromise(CONFIG.CUSTOM_FILE, JSON.stringify(toUpdateJSON, undefined, 2))
 
   reloadConfig()