diff --git a/gtk2_ardour/engine_dialog.h b/gtk2_ardour/engine_dialog.h
index 56a0722118..40384888f4 100644
--- a/gtk2_ardour/engine_dialog.h
+++ b/gtk2_ardour/engine_dialog.h
@@ -53,8 +53,6 @@ class EngineControl : public Gtk::VBox {
 	Gtk::SpinButton priority_spinner;
 	Gtk::Adjustment ports_adjustment;
 	Gtk::SpinButton ports_spinner;
-	Gtk::SpinButton input_channels;
-	Gtk::SpinButton output_channels;
 	Gtk::Adjustment input_latency_adjustment;
 	Gtk::SpinButton input_latency;
 	Gtk::Adjustment output_latency_adjustment;