diff --git a/actionpack/lib/action_controller/integration.rb b/actionpack/lib/action_controller/integration.rb
index 6ab50f3768..ce4529699b 100644
--- a/actionpack/lib/action_controller/integration.rb
+++ b/actionpack/lib/action_controller/integration.rb
@@ -78,9 +78,6 @@ module ActionController
 
         unless defined? @named_routes_configured
           # install the named routes in this session instance.
-          # But we have to disable the optimisation code so that we can
-          # generate routes without @request being initialized
-          Base.optimise_named_routes=false
           Routing::Routes.reload!
           klass = class<<self; self; end
           Routing::Routes.install_helpers(klass)