diff --git a/libs/ardour/session_transport.cc b/libs/ardour/session_transport.cc
index afd26d0373..b2364054fa 100644
--- a/libs/ardour/session_transport.cc
+++ b/libs/ardour/session_transport.cc
@@ -1221,11 +1221,13 @@ Session::butler_transport_work ()
 void
 Session::non_realtime_overwrite (int on_entry, bool& finished)
 {
-	boost::shared_ptr<RouteList> rl = routes.reader();
+	RouteList rl (*(routes.reader ()));
+
 	if (is_auditioning ()) {
-		rl->push_back (auditioner);
+		rl.push_back (auditioner);
 	}
-	for (RouteList::iterator i = rl->begin(); i != rl->end(); ++i) {
+
+	for (RouteList::iterator i = rl.begin(); i != rl.end(); ++i) {
 		boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
 		if (tr && tr->pending_overwrite ()) {
 			tr->overwrite_existing_buffers ();