diff --git a/src/test/regress/expected/pg16.out b/src/test/regress/expected/pg16.out
index 80c2bb3df..a172c54c0 100644
--- a/src/test/regress/expected/pg16.out
+++ b/src/test/regress/expected/pg16.out
@@ -878,6 +878,7 @@ SET search_path TO pg16;
 -- We already don't propagate these commands automatically
 -- Testing here with run_command_on_workers
 -- Relevant PG commit: https://github.com/postgres/postgres/commit/2cbc3c1
+-- Testing only DATABASE here as SYSTEM produces aio output in PG18
 REINDEX DATABASE;
 SELECT result FROM run_command_on_workers
 ($$REINDEX DATABASE$$);
@@ -887,15 +888,6 @@ SELECT result FROM run_command_on_workers
  REINDEX
 (2 rows)
 
-REINDEX SYSTEM;
-SELECT result FROM run_command_on_workers
-($$REINDEX SYSTEM$$);
- result
----------------------------------------------------------------------
- REINDEX
- REINDEX
-(2 rows)
-
 --
 -- random_normal() to provide normally-distributed random numbers
 -- adding here the same tests as the ones with random() in aggregate_support.sql
diff --git a/src/test/regress/sql/pg16.sql b/src/test/regress/sql/pg16.sql
index a57c4c5b4..bada3649c 100644
--- a/src/test/regress/sql/pg16.sql
+++ b/src/test/regress/sql/pg16.sql
@@ -521,15 +521,12 @@ SET search_path TO pg16;
 -- We already don't propagate these commands automatically
 -- Testing here with run_command_on_workers
 -- Relevant PG commit: https://github.com/postgres/postgres/commit/2cbc3c1
+-- Testing only DATABASE here as SYSTEM produces aio output in PG18
 
 REINDEX DATABASE;
 SELECT result FROM run_command_on_workers
 ($$REINDEX DATABASE$$);
 
-REINDEX SYSTEM;
-SELECT result FROM run_command_on_workers
-($$REINDEX SYSTEM$$);
-
 --
 -- random_normal() to provide normally-distributed random numbers
 -- adding here the same tests as the ones with random() in aggregate_support.sql