diff --git a/apps/readest-app/src/app/api/opds/proxy/route.ts b/apps/readest-app/src/app/api/opds/proxy/route.ts
index 49fd8a85..799b502a 100644
--- a/apps/readest-app/src/app/api/opds/proxy/route.ts
+++ b/apps/readest-app/src/app/api/opds/proxy/route.ts
@@ -125,6 +125,7 @@ async function handleRequest(request: NextRequest, method: 'GET' | 'HEAD') {
           'Access-Control-Allow-Origin': '*',
           'Access-Control-Allow-Methods': 'GET, HEAD, OPTIONS',
           'Access-Control-Allow-Headers': 'Content-Type',
+          'Access-Control-Expose-Headers': 'X-Content-Length',
         },
       });
     } else {