diff --git a/actionpack/lib/action_controller/metal/http_authentication.rb b/actionpack/lib/action_controller/metal/http_authentication.rb
index 09ff376a91..4972c6bede 100644
--- a/actionpack/lib/action_controller/metal/http_authentication.rb
+++ b/actionpack/lib/action_controller/metal/http_authentication.rb
@@ -1,4 +1,4 @@
-require 'active_support/base64'
+require 'base64'
 require 'active_support/core_ext/object/blank'
 
 module ActionController