diff --git a/src/test/regress/expected/aggregates.out b/src/test/regress/expected/aggregates.out
index 2a806be3277..8f96c4ed534 100644
--- a/src/test/regress/expected/aggregates.out
+++ b/src/test/regress/expected/aggregates.out
@@ -1872,6 +1872,7 @@ set parallel_tuple_cost TO 0;
 set parallel_leader_participation TO 0;
 set min_parallel_table_scan_size = 0;
 set bytea_output = 'escape';
+set max_parallel_workers_per_gather = 2;
 -- create a view as we otherwise have to repeat this query a few times.
 create view v_pagg_test AS
 select
diff --git a/src/test/regress/sql/aggregates.sql b/src/test/regress/sql/aggregates.sql
index 12e24a0dfad..f6815a1784d 100644
--- a/src/test/regress/sql/aggregates.sql
+++ b/src/test/regress/sql/aggregates.sql
@@ -728,6 +728,7 @@ set parallel_tuple_cost TO 0;
 set parallel_leader_participation TO 0;
 set min_parallel_table_scan_size = 0;
 set bytea_output = 'escape';
+set max_parallel_workers_per_gather = 2;
 
 -- create a view as we otherwise have to repeat this query a few times.
 create view v_pagg_test AS