diff --git a/tests/phpunit/CiviTest/CiviUnitTestCase.php b/tests/phpunit/CiviTest/CiviUnitTestCase.php
index 985e31c88928..e97f96cffb48 100644
--- a/tests/phpunit/CiviTest/CiviUnitTestCase.php
+++ b/tests/phpunit/CiviTest/CiviUnitTestCase.php
@@ -3669,6 +3669,9 @@ protected function validateAllContributions(): void {
       foreach ($membershipPayments as $payment) {
         $this->assertContains($payment['membership_id'], $memberships);
       }
+      foreach ($participantPayments as $payment) {
+        $this->assertContains($payment['participant_id'], $participants);
+      }
       $this->assertEquals($taxTotal, (float) ($contribution['tax_amount'] ?? 0));
       $this->assertEquals($total + $taxTotal, $contribution['total_amount']);
     }