diff --git a/src/test/regress/expected/failure_multi_shard_update_delete.out b/src/test/regress/expected/failure_multi_shard_update_delete.out
index cebd7f8c6..ffc08aef7 100644
--- a/src/test/regress/expected/failure_multi_shard_update_delete.out
+++ b/src/test/regress/expected/failure_multi_shard_update_delete.out
@@ -6,6 +6,7 @@ SET SEARCH_PATH = multi_shard;
 SET citus.shard_count TO 4;
 SET citus.next_shard_id TO 201000;
 SET citus.shard_replication_factor TO 1;
+SET citus.max_adaptive_executor_pool_size TO 1;
 -- do not cache any connections
 SET citus.max_cached_conns_per_worker TO 0;
 SELECT citus.mitmproxy('conn.allow()');
diff --git a/src/test/regress/sql/failure_multi_shard_update_delete.sql b/src/test/regress/sql/failure_multi_shard_update_delete.sql
index 60a4078e2..d9d0c2250 100644
--- a/src/test/regress/sql/failure_multi_shard_update_delete.sql
+++ b/src/test/regress/sql/failure_multi_shard_update_delete.sql
@@ -7,6 +7,7 @@ SET SEARCH_PATH = multi_shard;
 SET citus.shard_count TO 4;
 SET citus.next_shard_id TO 201000;
 SET citus.shard_replication_factor TO 1;
+SET citus.max_adaptive_executor_pool_size TO 1;
 
 -- do not cache any connections
 SET citus.max_cached_conns_per_worker TO 0;