diff --git a/libs/ardour/transport_master.cc b/libs/ardour/transport_master.cc
index 2d90d0516b..8deabab22e 100644
--- a/libs/ardour/transport_master.cc
+++ b/libs/ardour/transport_master.cc
@@ -246,9 +246,6 @@ void
 TransportMaster::set_session (Session* s)
 {
 	_session = s;
-	if (!_session) {
-		unregister_port ();
-	}
 }
 
 int