diff --git a/tests/Feature/OpenBanking/DailyEmailTransactionsIndexTest.php b/tests/Feature/OpenBanking/DailyEmailTransactionsIndexTest.php
index 03c3b021..b06c92c9 100644
--- a/tests/Feature/OpenBanking/DailyEmailTransactionsIndexTest.php
+++ b/tests/Feature/OpenBanking/DailyEmailTransactionsIndexTest.php
@@ -11,4 +11,5 @@ it('has a composite index supporting the daily synced-email transaction query',
     expect($match)->not->toBeNull(
         'Expected a (user_id, source, created_at) index on transactions for the daily email query.'
     );
+    expect($match['name'])->toBe('idx_transactions_user_source_created');
 });