diff --git a/src/bin/pg_amcheck/t/003_check.pl b/src/bin/pg_amcheck/t/003_check.pl
index 0a7795bb64d..54b2b86a49b 100644
--- a/src/bin/pg_amcheck/t/003_check.pl
+++ b/src/bin/pg_amcheck/t/003_check.pl
@@ -468,7 +468,7 @@ command_fails_like(
 	'pg_amcheck rejects garbage startblock');
 
 command_fails_like(
-	[ @cmd, 'db1', '-s', 's5', '--endblock', '1234junk' ],
+	[ @cmd, '-s', 's5', '--endblock', '1234junk', 'db1' ],
 	qr/invalid end block/,
 	'pg_amcheck rejects garbage endblock');