diff --git a/actionpack/lib/action_dispatch/middleware/cookies.rb b/actionpack/lib/action_dispatch/middleware/cookies.rb
index 0f316be68186d2de36c0846f9792cba2e08a7f86..b653e4eacd66cea68afb111f9af8b41a627344ae 100644
--- a/actionpack/lib/action_dispatch/middleware/cookies.rb
+++ b/actionpack/lib/action_dispatch/middleware/cookies.rb
@@ -226,10 +226,6 @@ def signed_or_encrypted
       def upgrade_legacy_signed_cookies?
         request.secret_token.present? && request.secret_key_base.present?
       end
-
-      def key_generator
-        request.key_generator
-      end
     end
 
     # Passing the ActiveSupport::MessageEncryptor::NullSerializer downstream
@@ -501,6 +497,10 @@ def serializer
         def digest
           request.cookies_digest || 'SHA1'
         end
+
+        def key_generator
+          request.key_generator
+        end
     end
 
     class SignedCookieJar < AbstractCookieJar # :nodoc: