diff --git a/actionpack/lib/action_controller/metal/session_management.rb b/actionpack/lib/action_controller/metal/session_management.rb
index 9f4c4b8b39..d70f40ce7a 100644
--- a/actionpack/lib/action_controller/metal/session_management.rb
+++ b/actionpack/lib/action_controller/metal/session_management.rb
@@ -1,6 +1,6 @@
 module ActionController #:nodoc:
   module SessionManagement #:nodoc:
-    include ActiveSupport::Concern
+    extend ActiveSupport::Concern
 
     include ActionController::Configuration