diff --git a/gtk2_ardour/generic_pluginui.cc b/gtk2_ardour/generic_pluginui.cc
index 99969e1b61..2f96f30b21 100644
--- a/gtk2_ardour/generic_pluginui.cc
+++ b/gtk2_ardour/generic_pluginui.cc
@@ -83,6 +83,7 @@ GenericPluginUI::GenericPluginUI (boost::shared_ptr<PluginInsert> pi, bool scrol
 
 	HBox* constraint_hbox = manage (new HBox);
 	HBox* smaller_hbox = manage (new HBox);
+	smaller_hbox->set_spacing (4);
 	Label* combo_label = manage (new Label (_("<span size=\"large\">Presets</span>")));
 	combo_label->set_use_markup (true);