diff --git a/age--1.7.0--y.y.y.sql b/age--1.7.0--y.y.y.sql
index b40cde092..8b308d1f1 100644
--- a/age--1.7.0--y.y.y.sql
+++ b/age--1.7.0--y.y.y.sql
@@ -1013,7 +1013,7 @@ BEGIN
         EXECUTE format(
             'CREATE TEMP TABLE _ag_sg_vstage ON COMMIT DROP AS '
             'SELECT t.id AS old_id, '
-            '       ag_catalog._graphid(%s, nextval(%L)) AS new_id, '
+            '       ag_catalog._graphid(%s, nextval(%L::regclass)) AS new_id, '
             '       t.properties AS props '
             'FROM ONLY %s t '
             'WHERE EXISTS (SELECT 1 FROM _ag_sg_kept_v k WHERE k.gid = t.id)',
@@ -1076,7 +1076,7 @@ BEGIN
         DROP TABLE IF EXISTS _ag_sg_estage;
         EXECUTE format(
             'CREATE TEMP TABLE _ag_sg_estage ON COMMIT DROP AS '
-            'SELECT ag_catalog._graphid(%s, nextval(%L)) AS new_id, '
+            'SELECT ag_catalog._graphid(%s, nextval(%L::regclass)) AS new_id, '
             '       vs.new_id AS new_start, ve.new_id AS new_end, '
             '       x.properties AS props '
             'FROM ONLY %s x '
diff --git a/sql/age_subgraph.sql b/sql/age_subgraph.sql
index 960790ded..0d7e3648d 100644
--- a/sql/age_subgraph.sql
+++ b/sql/age_subgraph.sql
@@ -205,7 +205,7 @@ BEGIN
         EXECUTE format(
             'CREATE TEMP TABLE _ag_sg_vstage ON COMMIT DROP AS '
             'SELECT t.id AS old_id, '
-            '       ag_catalog._graphid(%s, nextval(%L)) AS new_id, '
+            '       ag_catalog._graphid(%s, nextval(%L::regclass)) AS new_id, '
             '       t.properties AS props '
             'FROM ONLY %s t '
             'WHERE EXISTS (SELECT 1 FROM _ag_sg_kept_v k WHERE k.gid = t.id)',
@@ -268,7 +268,7 @@ BEGIN
         DROP TABLE IF EXISTS _ag_sg_estage;
         EXECUTE format(
             'CREATE TEMP TABLE _ag_sg_estage ON COMMIT DROP AS '
-            'SELECT ag_catalog._graphid(%s, nextval(%L)) AS new_id, '
+            'SELECT ag_catalog._graphid(%s, nextval(%L::regclass)) AS new_id, '
             '       vs.new_id AS new_start, ve.new_id AS new_end, '
             '       x.properties AS props '
             'FROM ONLY %s x '