diff --git a/tests/system-test/2-query/union.py b/tests/system-test/2-query/union.py
index 24ccac5d90..a6cccb8aaa 100644
--- a/tests/system-test/2-query/union.py
+++ b/tests/system-test/2-query/union.py
@@ -434,7 +434,7 @@ class TDTestCase:
         tdSql.checkRows(2)
         sql = "select db_name `TABLE_CAT`, '' `TABLE_SCHEM`, stable_name `TABLE_NAME`, 'TABLE' `TABLE_TYPE`, table_comment `REMARKS` from information_schema.ins_stables union all select db_name `TABLE_CAT`, '' `TABLE_SCHEM`, table_name `TABLE_NAME`,  case when `type`='SYSTEM_TABLE' then 'TABLE'       when `type`='NORMAL_TABLE' then 'TABLE'       when `type`='CHILD_TABLE' then 'TABLE'       else 'UNKNOWN'  end `TABLE_TYPE`, table_comment `REMARKS` from information_schema.ins_tables union all select db_name `TABLE_CAT`, '' `TABLE_SCHEM`, view_name `TABLE_NAME`, 'VIEW' `TABLE_TYPE`, NULL `REMARKS` from information_schema.ins_views"
         tdSql.query(sql, queryTimes=1)
-        tdSql.checkRows(48)
+        tdSql.checkRows(49)
 
     def stop(self):
         tdSql.close()