diff -u b/core/lib/Drupal/Core/Render/Element/StatusReport.php b/core/lib/Drupal/Core/Render/Element/StatusReport.php
--- b/core/lib/Drupal/Core/Render/Element/StatusReport.php
+++ b/core/lib/Drupal/Core/Render/Element/StatusReport.php
@@ -52,7 +52,7 @@
     // Order the grouped requirements by a set order.
     $order = array_flip($element['#priorities']);
     uksort($grouped_requirements, function ($a, $b) use ($order) {
-      return $order[$a] > $order[$b] ? 1 : -1;
+      return $order[$a] <=> $order[$b];
     });
 
     $element['#grouped_requirements'] = $grouped_requirements;