diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index b95b8d304e..72c2a8654f 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -1485,7 +1485,7 @@ Session::resort_routes_using (boost::shared_ptr<RouteList> r)
 			trace_terminal (*i, *i);
 		}
 
-		r = sorted_routes;
+		*r = *sorted_routes;
 
 #ifndef NDEBUG
 		DEBUG_TRACE (DEBUG::Graph, "Routes resorted, order follows:\n");