diff --git a/packages/block-library/src/page-list/index.php b/packages/block-library/src/page-list/index.php
index 6d91e2092a79cf..395702068ec83b 100644
--- a/packages/block-library/src/page-list/index.php
+++ b/packages/block-library/src/page-list/index.php
@@ -258,7 +258,7 @@ function render_block_core_page_list( $attributes, $content, $block ) {
 	static $block_id = 0;
 	++$block_id;
 
-	$parent_page_id_attr = isset( $attributes['parentPageID'] ) ? $attributes['parentPageID'] : null;
+	$parent_page_id_attr = $attributes['parentPageID'] ?? null;
 	$parent_page_id      = is_scalar( $parent_page_id_attr ) ? (int) $parent_page_id_attr : 0;
 	$is_nested           = ! empty( $block->context['core/isInsideSubmenu'] );