diff --git a/actionmailer/test/mail_service_test.rb b/actionmailer/test/mail_service_test.rb
index 7b5f8b1ffcc96f530c209cdee363abce8bf60aae..396dd00a9141e7ffe3b7fefe1f66a6ddeee151af 100644
--- a/actionmailer/test/mail_service_test.rb
+++ b/actionmailer/test/mail_service_test.rb
@@ -679,7 +679,7 @@ def test_doesnt_raise_errors_when_raise_delivery_errors_is_false
   end
 
   def test_performs_delivery_via_sendmail
-    IO.expects(:popen).once.with('/usr/sbin/sendmail -i -t test@localhost', 'w+')
+    IO.expects(:popen).once.with('/usr/sbin/sendmail -i -t -f "system@loudthinking.com" test@localhost', 'w+')
     ActionMailer::Base.delivery_method = :sendmail
     TestMailer.deliver_signed_up(@recipient)
   end