diff --git a/gtk2_ardour/lv2_plugin_ui.cc b/gtk2_ardour/lv2_plugin_ui.cc
index c732aca567..8a6d5260b4 100644
--- a/gtk2_ardour/lv2_plugin_ui.cc
+++ b/gtk2_ardour/lv2_plugin_ui.cc
@@ -282,7 +282,21 @@ LV2PluginUI::lv2ui_instantiate(const std::string& title)
 		_lv2->enable_ui_emission();
 	}
 
-	const LilvUI* ui = (const LilvUI*)_lv2->c_ui();
+	const LilvUI*   ui     = (const LilvUI*)_lv2->c_ui();
+	const LilvNode* bundle = lilv_ui_get_bundle_uri(ui);
+	const LilvNode* binary = lilv_ui_get_binary_uri(ui);
+#ifdef HAVE_LILV_0_21_1
+	char* ui_bundle_path = lilv_file_uri_parse(lilv_node_as_uri(bundle), NULL);
+	char* ui_binary_path = lilv_file_uri_parse(lilv_node_as_uri(binary), NULL);
+#else
+	char* ui_bundle_path = strdup(lilv_uri_to_path(lilv_node_as_uri(bundle)));
+	char* ui_binary_path = strdup(lilv_uri_to_path(lilv_node_as_uri(binary)));
+#endif
+	if (!ui_bundle_path || !ui_binary_path) {
+		error << _("failed to get path for UI bindle or binary") << endmsg;
+		return;
+	}
+
 	_inst = suil_instance_new(
 		ui_host,
 		this,
@@ -290,10 +304,12 @@ LV2PluginUI::lv2ui_instantiate(const std::string& title)
 		_lv2->uri(),
 		lilv_node_as_uri(lilv_ui_get_uri(ui)),
 		lilv_node_as_uri((const LilvNode*)_lv2->c_ui_type()),
-		lilv_uri_to_path(lilv_node_as_uri(lilv_ui_get_bundle_uri(ui))),
-		lilv_uri_to_path(lilv_node_as_uri(lilv_ui_get_binary_uri(ui))),
+		ui_bundle_path,
+		ui_binary_path,
 		features);
 
+	free(ui_bundle_path);
+	free(ui_binary_path);
 	free(features);
 
 #define GET_WIDGET(inst) suil_instance_get_widget((SuilInstance*)inst);
diff --git a/libs/ardour/wscript b/libs/ardour/wscript
index f1167e8611..474ffdc6c1 100644
--- a/libs/ardour/wscript
+++ b/libs/ardour/wscript
@@ -276,6 +276,8 @@ def configure(conf):
                           atleast_version='0.16.0', mandatory=False)
         autowaf.check_pkg(conf, 'lilv-0', uselib_store='LILV_0_19_2',
                           atleast_version='0.19.2', mandatory=False)
+        autowaf.check_pkg(conf, 'lilv-0', uselib_store='LILV_0_21_1',
+                          atleast_version='0.21.1', mandatory=False)
         autowaf.check_pkg(conf, 'suil-0', uselib_store='SUIL',
                           atleast_version='0.6.0', mandatory=False)
         conf.define ('LV2_SUPPORT', 1)