diff --git a/ext/lv2/gstlv2.c b/ext/lv2/gstlv2.c
index 17a86242ab..de8f4bedb7 100644
--- a/ext/lv2/gstlv2.c
+++ b/ext/lv2/gstlv2.c
@@ -203,14 +203,11 @@ plugin_init (GstPlugin * plugin)
   input_class = lilv_new_uri (world, LILV_URI_INPUT_PORT);
   output_class = lilv_new_uri (world, LILV_URI_OUTPUT_PORT);
 
-#define NS_LV2 "http://lv2plug.in/ns/lv2core#"
-#define NS_PG  "http://lv2plug.in/ns/ext/port-groups#"
-
-  integer_prop = lilv_new_uri (world, NS_LV2 "integer");
-  toggled_prop = lilv_new_uri (world, NS_LV2 "toggled");
-  in_place_broken_pred = lilv_new_uri (world, NS_LV2 "inPlaceBroken");
+  integer_prop = lilv_new_uri (world, LV2_CORE__integer);
+  toggled_prop = lilv_new_uri (world, LV2_CORE__toggled);
+  designation_pred = lilv_new_uri (world, LV2_CORE__designation);
+  in_place_broken_pred = lilv_new_uri (world, LV2_CORE__inPlaceBroken);
   group_pred = lilv_new_uri (world, LV2_PORT_GROUPS__group);
-  has_role_pred = lilv_new_uri (world, NS_PG "role");
 
   center_role = lilv_new_uri (world, LV2_PORT_GROUPS__center);
   left_role = lilv_new_uri (world, LV2_PORT_GROUPS__left);
@@ -285,9 +282,9 @@ __attribute__ ((destructor))
 
   lilv_node_free (integer_prop);
   lilv_node_free (toggled_prop);
+  lilv_node_free (designation_pred);
   lilv_node_free (in_place_broken_pred);
   lilv_node_free (group_pred);
-  lilv_node_free (has_role_pred);
 
   lilv_node_free (center_role);
   lilv_node_free (left_role);
diff --git a/ext/lv2/gstlv2.h b/ext/lv2/gstlv2.h
index bacfd87dc8..340752a93e 100644
--- a/ext/lv2/gstlv2.h
+++ b/ext/lv2/gstlv2.h
@@ -35,9 +35,9 @@ LilvNode *input_class;
 LilvNode *output_class;
 LilvNode *integer_prop;
 LilvNode *toggled_prop;
+LilvNode *designation_pred;
 LilvNode *in_place_broken_pred;
 LilvNode *group_pred;
-LilvNode *has_role_pred;
 
 LilvNode *center_role;
 LilvNode *left_role;