diff --git a/backend/src/api/archives.ts b/backend/src/api/archives.ts
index 83fdbf83..b1330a98 100644
--- a/backend/src/api/archives.ts
+++ b/backend/src/api/archives.ts
@@ -30,6 +30,7 @@ export function initArchives(app: express.Express) {
     }
 
     res.setHeader("Content-Type", "text/plain; charset=UTF-8");
+    res.setHeader("X-Content-Type-Options", "nosniff");
     res.end(body);
   });
 }