diff --git a/tests/VObject/Component/VCalendarTest.php b/tests/VObject/Component/VCalendarTest.php
index 17332c87..54dcdae0 100644
--- a/tests/VObject/Component/VCalendarTest.php
+++ b/tests/VObject/Component/VCalendarTest.php
@@ -785,8 +785,8 @@ public function testNodeInValidationErrorHasLineIndexAndLineStringProps(): void
         foreach ($result as $idx => $warning) {
             self::assertArrayHasKey('node', $warning);
             self::assertInstanceOf(VObject\Property\ICalendar\DateTime::class, $warning['node']);
-            self::assertObjectHasProperty('lineIndex', $warning['node']);
-            self::assertObjectHasProperty('lineString', $warning['node']);
+            self::assertObjectHasAttribute('lineIndex', $warning['node']);
+            self::assertObjectHasAttribute('lineString', $warning['node']);
             switch ($idx) {
                 case 0:
                     self::assertEquals('10', $warning['node']->lineIndex);