diff --git a/gtk2_ardour/monitor_section.cc b/gtk2_ardour/monitor_section.cc
index bf726bfd74..ffa757c2b7 100644
--- a/gtk2_ardour/monitor_section.cc
+++ b/gtk2_ardour/monitor_section.cc
@@ -629,6 +629,7 @@ MonitorSection::set_session (Session* s)
 
 			if (_ui_initialized) {
 				update_processor_box ();
+				update_output_display ();
 			}
 
 			SYNCHRONIZE_TOGGLE_ACTION (ActionManager::get_toggle_action (X_("Monitor"), "UseMonitorSection"), true);