diff --git a/api/src/core/api.js b/api/src/core/api.js
index fc890ad2..364764c0 100644
--- a/api/src/core/api.js
+++ b/api/src/core/api.js
@@ -267,7 +267,8 @@ export const runAPI = async (express, app, __dirname, isPrimary = true) => {
     app.use('/tunnel', cors({
         methods: ['GET'],
         exposedHeaders: [
-            'Estimated-Content-Length'
+            'Estimated-Content-Length',
+            'Content-Disposition'
         ],
         ...corsConfig,
     }));