diff --git a/src/test/authentication/t/007_pre_auth.pl b/src/test/authentication/t/007_pre_auth.pl
index 04063f4721d9..9c2e3341d768 100644
--- a/src/test/authentication/t/007_pre_auth.pl
+++ b/src/test/authentication/t/007_pre_auth.pl
@@ -18,9 +18,14 @@ if ($ENV{enable_injection_points} ne 'yes')
 
 my $node = PostgreSQL::Test::Cluster->new('primary');
 $node->init;
+
+# Disable autovacuum and logical replication workers; these could reach
+# the injection point wait.
 $node->append_conf(
 	'postgresql.conf', q[
 log_connections = 'receipt,authentication'
+autovacuum = off
+max_logical_replication_workers = 0
 ]);
 
 $node->start;