diff --git a/libs/backends/dummy/dummy_audiobackend.cc b/libs/backends/dummy/dummy_audiobackend.cc
index ba8e98cad8..cd09a64c65 100644
--- a/libs/backends/dummy/dummy_audiobackend.cc
+++ b/libs/backends/dummy/dummy_audiobackend.cc
@@ -475,6 +475,8 @@ DummyAudioBackend::process_thread_count ()
 void
 DummyAudioBackend::update_latencies ()
 {
+	// trigger latency callback in RT thread (locked graph)
+	port_connect_add_remove_callback();
 }
 
 /* PORTENGINE API */
@@ -1057,6 +1059,10 @@ DummyAudioBackend::main_process_thread ()
 		if (connections_changed) {
 			manager.graph_order_callback();
 		}
+		if (connections_changed || ports_changed) {
+			engine.latency_callback(false);
+			engine.latency_callback(true);
+		}
 
 	}
 	_running = false;