diff --git a/actionmailbox/lib/rails/generators/test_unit/templates/mailbox_test.rb.tt b/actionmailbox/lib/rails/generators/test_unit/templates/mailbox_test.rb.tt
index 0b51f29fe4c066e3b2b11bd2632f3ea937a13efe..3e215b4d0bed7b79218d81cafb4758d17801e73e 100644
--- a/actionmailbox/lib/rails/generators/test_unit/templates/mailbox_test.rb.tt
+++ b/actionmailbox/lib/rails/generators/test_unit/templates/mailbox_test.rb.tt
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require "test_helper"
 
 class <%= class_name %>MailboxTest < ActionMailbox::TestCase