diff --git a/core/modules/migrate_drupal/src/Entity/Migration.php b/core/modules/migrate_drupal/src/Entity/Migration.php
index 7875ddf63fc..4a34c1671a3 100644
--- a/core/modules/migrate_drupal/src/Entity/Migration.php
+++ b/core/modules/migrate_drupal/src/Entity/Migration.php
@@ -16,7 +16,7 @@ class Migration extends BaseMigration implements MigrationInterface {
    *
    * @var array
    */
-  public $load = array();
+  protected $load = array();
 
   /**
    * The load plugin.