diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 5dc6229ff0..cb674227a7 100644
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -2920,6 +2920,8 @@ EngineControl::manage_control_app_sensitivity ()
 	} else {
 		control_app_button.set_sensitive (true);
 	}
+
+	lm_button_audio.set_sensitive (backend->can_measure_systemic_latency ());
 }
 
 void