diff --git a/libs/ardour/port.cc b/libs/ardour/port.cc
index f2fba52116..9bc318a144 100644
--- a/libs/ardour/port.cc
+++ b/libs/ardour/port.cc
@@ -348,6 +348,7 @@ void
 Port::reset ()
 {
 	_last_monitor = false;
+	_externally_connected = 0;
 }
 
 void