diff --git a/gtk2_ardour/ardour_ui_ed.cc b/gtk2_ardour/ardour_ui_ed.cc
index d16b9f411e..2cb2fae39d 100644
--- a/gtk2_ardour/ardour_ui_ed.cc
+++ b/gtk2_ardour/ardour_ui_ed.cc
@@ -952,6 +952,8 @@ ARDOUR_UI::on_theme_changed ()
 	LV2Plugin::set_global_ui_foreground_color (UIConfiguration::instance().color ("gtk_foreground"));
 	LV2Plugin::set_global_ui_contrasting_color (UIConfiguration::instance().color ("theme:contrasting clock")); // more contrast that "theme:contrasting"
 	LV2Plugin::set_global_ui_scale_factor (UIConfiguration::instance().get_ui_scale());
+	LV2Plugin::set_global_ui_style_boxy (UIConfiguration::instance().get_boxy_buttons());
+	LV2Plugin::set_global_ui_style_flat (UIConfiguration::instance().get_flat_buttons());
 }
 
 void