diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index fd2226b1f..2485c44a7 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -22,7 +22,8 @@ class AttachmentsController < ApplicationController
       send_file absolute_path(local_path(@file)),filename: @file.title, disposition: 'inline',type: 'application/pdf'
     elsif type_attachment == "MP4"
       response.header["Accept-Ranges"] = "bytes"
-      send_file absolute_path(local_path(@file)),filename: @file.title, disposition: 'inline', type: @file.content_type.presence || 'application/octet-stream'
+      send_file absolute_path(local_path(@file)),filename: @file.title, disposition: 'inline',
+                type: @file.content_type.presence || 'application/octet-stream', x_sendfile: true
     else
       send_file(absolute_path(local_path(@file)), filename: @file.title,stream:false, type: @file.content_type.presence || 'application/octet-stream')
     end