diff --git a/core/includes/menu.inc b/core/includes/menu.inc
index ab14b9b753..fc69ee4cc3 100644
--- a/core/includes/menu.inc
+++ b/core/includes/menu.inc
@@ -11,6 +11,7 @@
  */
 
 use Drupal\Component\Render\FormattableMarkup;
+use Drupal\Core\Url;
 
 /**
  * Prepares variables for single local task link templates.
@@ -77,6 +78,51 @@ function template_preprocess_menu_local_action(&$variables) {
   ];
 }
 
+/**
+ * Prepares variables for menu templates on the homepage.
+ *
+ * Default template: menu.html.twig.
+ *
+ * @param $variables
+ *   An Associative array containing:
+ *   - menu_name: The machine name of the menu.
+ *   - items: A nested list of menu items. Each menu item contains:
+ *     - attributes: HTML attributes for the menu item.
+ *     - below: The menu item child items.
+ *     - title: The menu link title.
+ *     - url: The menu link url, instance of \Drupal\Core\Url
+ *     - localized_options: Menu link localized options.
+ *     - is_expanded: TRUE if the link has visible children within the current
+ *       menu tree.
+ *     - is_collapsed: TRUE if the link has children within the current menu tree
+ *       that are not currently visible.
+ *     - in_active_trail: TRUE if the link is in the active trail.
+ */
+function template_preprocess_menu(&$variables) {
+  if (!\Drupal::service('path.matcher')->isFrontPage()) {
+    return;
+  }
+
+  $homepagePath = \Drupal::config('system.site')->get('page.front');
+  $homepageUrl = \Drupal::service('path.validator')->getUrlIfValid($homepagePath);
+  if (!$homepageUrl instanceof Url) {
+    return;
+  }
+
+  $validHomepageRoutes = ['<front>', $homepageUrl->getRouteName()];
+  foreach ($variables['items'] as $key => $item) {
+    /** @var \Drupal\Core\Url $url */
+    $url = $item['url'];
+    if (
+      $url instanceof Url &&
+      $url->isRouted() &&
+      \in_array($url->getRouteName(), $validHomepageRoutes, TRUE)
+    ) {
+      $variables['items'][$key]['in_active_trail'] = TRUE;
+    }
+  }
+}
+
 /**
  * Returns an array containing the names of system-defined (default) menus.
  */