diff --git a/libs/ardour/port_insert.cc b/libs/ardour/port_insert.cc
index 917f99caca..15c5db5000 100644
--- a/libs/ardour/port_insert.cc
+++ b/libs/ardour/port_insert.cc
@@ -235,7 +235,9 @@ PortInsert::signal_latency() const
 	 */
 
 	if (_measured_latency == 0) {
-		return _session.engine().samples_per_cycle() + _input->effective_latency ();
+		return _session.engine().samples_per_cycle()
+		       + _input->connected_latency (false);
+		       + _output->connected_latency (true);
 	} else {
 		return _measured_latency;
 	}