diff --git a/regression/expected/pgsm_query_id.out b/regression/expected/pgsm_query_id.out
index 9dc2938..c57e91c 100644
--- a/regression/expected/pgsm_query_id.out
+++ b/regression/expected/pgsm_query_id.out
@@ -87,8 +87,8 @@ SELECT datname, pgsm_query_id, query, calls FROM pg_stat_monitor ORDER BY pgsm_q
  db1                | 1897482803466821995 | SELECT * FROM t2                                    |     3
  db1                | 1988437669671417938 | SELECT * FROM t1                                    |     1
  db2                | 1988437669671417938 | SELECT * FROM t1                                    |     1
- db1                | 2864453209316739369 | select $1 + $2                                      |     1
- db2                | 2864453209316739369 | select $1 + $2                                      |     1
+ db1                | 2864453209316739369 | select 1 + 2                                        |     1
+ db2                | 2864453209316739369 | select 1 + 2                                        |     1
  db2                | 6220142855706866455 | set pg_stat_monitor.pgsm_enable_pgsm_query_id = on  |     1
  db2                | 6633979598391393345 | SELECT * FROM t3 where c = 20                       |     1
  db1                | 8140395000078788481 | SELECT *, ADD(1, 2) FROM t1                         |     1
diff --git a/regression/expected/top_query.out b/regression/expected/top_query.out
index 38f0b37..2f3c3ca 100644
--- a/regression/expected/top_query.out
+++ b/regression/expected/top_query.out
@@ -26,7 +26,7 @@ SELECT add2(1,2);
 SELECT query, top_query FROM pg_stat_monitor ORDER BY query COLLATE "C";
                             query                             |     top_query     
 --------------------------------------------------------------+-------------------
- (select $1 + $2)                                             | SELECT add2(1,2);
+ (select NULL + NULL)                                         | SELECT add2(1,2);
  CREATE OR REPLACE FUNCTION add(int, int) RETURNS INTEGER AS +| 
  $$                                                          +| 
  BEGIN                                                       +|