diff --git a/gtk2_ardour/plugin_pin_dialog.cc b/gtk2_ardour/plugin_pin_dialog.cc
index aa04b5cd02..108f1f2b8a 100644
--- a/gtk2_ardour/plugin_pin_dialog.cc
+++ b/gtk2_ardour/plugin_pin_dialog.cc
@@ -2147,8 +2147,11 @@ PluginPinDialog::map_height (Gtk::Allocation&)
 }
 
 void
-PluginPinDialog::route_processors_changed (ARDOUR::RouteProcessorChange)
+PluginPinDialog::route_processors_changed (ARDOUR::RouteProcessorChange c)
 {
+	if (c.type == RouteProcessorChange::CustomPinChange) {
+		return;
+	}
 	ppw.clear ();
 	_height_mapped = false;
 	scroller->remove ();