diff --git a/core/modules/menu_link_content/src/Plugin/migrate/process/d6/InternalUri.php b/core/modules/menu_link_content/src/Plugin/migrate/process/d6/InternalUri.php
index 23b6988..c035fb6 100644
--- a/core/modules/menu_link_content/src/Plugin/migrate/process/d6/InternalUri.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/process/d6/InternalUri.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\menu_link_content\Plugin\migrate\process\d6;
 
+use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Path\PathValidatorInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\Core\Routing\RouteBuilderInterface;
@@ -82,6 +83,9 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
       if ($this->pathValidator->getUrlIfValidWithoutAccessCheck($path)) {
         return 'internal:/' . $path;
       }
+      else {
+        $migrate_executable->saveMessage(SafeMarkup::format('The path "@path" failed validation and was dropped.', ['@path' => $path]));
+      }
     }
     else {
       return $path;