diff --git a/web/routes/file.js b/web/routes/file.js
index 25a87e9..3a5378a 100644
--- a/web/routes/file.js
+++ b/web/routes/file.js
@@ -65,7 +65,6 @@ export function* get(id, name, size) {
   }
 
   this.set('Content-type', type);
-  this.set('Content-length', file.file_size);
   this.set('Expires', new Date(2020, 1).toISOString());
   this.set('Cache-control', 'max-age=2592000');