diff --git a/actionpack/test/controller/http_token_authentication_test.rb b/actionpack/test/controller/http_token_authentication_test.rb
index 8174f92f7849f..fb6cf1f1bc3b6 100644
--- a/actionpack/test/controller/http_token_authentication_test.rb
+++ b/actionpack/test/controller/http_token_authentication_test.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "ostruct"
 require "abstract_unit"
 
 class HttpTokenAuthenticationTest < ActionController::TestCase