--- a/src/test/perl/PostgreSQL/Test/Cluster.pm
+++ b/src/test/perl/PostgreSQL/Test/Cluster.pm
@@ -2110,7 +2110,7 @@ sub background_pgbench
 	# IPC::Run would otherwise append to existing contents:
 	$$stdout = "" if ref($stdout);
 
-	my $harness = IPC::Run::start \@cmd, '<', \$stdin, '>', $stdout, '2>&1',
+	my $harness = IPC::Run::start \@cmd, '>', $stdout, '2>&1',
 	  $timer;
 
 	return $harness;