diff --git a/gtk2_ardour/livetrax_add_track_dialog.cc b/gtk2_ardour/livetrax_add_track_dialog.cc
index 7f2023e927..2f2c3075a2 100644
--- a/gtk2_ardour/livetrax_add_track_dialog.cc
+++ b/gtk2_ardour/livetrax_add_track_dialog.cc
@@ -31,6 +31,7 @@ LiveTraxAddTrackDialog::LiveTraxAddTrackDialog ()
 	, mono_button (channel_button_group, _("Mono"))
 	, stereo_button (channel_button_group, _("Stereo"))
 {
+	track_count_spinner.signal_activate().connect (sigc::bind (sigc::mem_fun (*this, &Gtk::Dialog::response), RESPONSE_OK));
 
 	get_vbox()->pack_start (track_count_spinner);
 	get_vbox()->pack_start (mono_button);