diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 24fc447267..4f77545d53 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -3171,17 +3171,6 @@ Session::remove_routes (boost::shared_ptr<RouteList> routes_to_remove)
      */
     for (RouteList::iterator iter = routes_to_remove->begin(); iter != routes_to_remove->end(); ++iter) {
         
-        for (size_t i = 0; i < (*iter)->input()->ports().num_ports(); ++i) {
-            _engine.unregister_port((*iter)->input()->ports().port(i));
-            PortEngine::PortHandle handle = (*iter)->input()->ports().port(i)->port_handle();
-            _engine.current_backend()->unregister_port(handle);
-        }
-        
-        for (size_t i = 0; i < (*iter)->output()->ports().num_ports(); ++i) {
-            _engine.unregister_port((*iter)->output()->ports().port(i));
-            PortEngine::PortHandle handle = (*iter)->output()->ports().port(i)->port_handle();
-            _engine.current_backend()->unregister_port(handle);
-        }
         (*iter)->drop_references ();
     }