diff --git a/core/modules/migrate/src/Plugin/MigrationPluginManager.php b/core/modules/migrate/src/Plugin/MigrationPluginManager.php
index 78e72c4..7714b2c 100644
--- a/core/modules/migrate/src/Plugin/MigrationPluginManager.php
+++ b/core/modules/migrate/src/Plugin/MigrationPluginManager.php
@@ -71,27 +71,27 @@ public function processDefinition(&$definition, $plugin_id) {
 
     // Loop over each of the definitions and tag it as config or content.
     /** @var \Drupal\migrate\Plugin\MigratePluginManagerInterface $migrate_plugin_manager */
-    $migrate_plugin_manager = \Drupal::getContainer()->get('plugin.manager.migrate.destination');
+    $migrate_plugin_manager = \Drupal::getContainer()
+      ->get('plugin.manager.migrate.destination');
     $destination = $migrate_plugin_manager->getDefinition($definition['destination']['plugin'], FALSE);
     if (!empty($destination['class'])) {
       $definition += [
         'migration_tags' => [],
       ];
-      $configuration_classes = [
-        EntityConfigBase::class,
-        Config::class,
-        UserData::class,
-        ComponentEntityDisplayBase::class,
-      ];
-      if ($this->classInArray($destination['class'], $configuration_classes)
-        && !in_array('Content', $definition['migration_tags'])
-        && !in_array('Configuration', $definition['migration_tags'])
-      ) {
+      $is_config_class = function ($class) {
+        return is_a($class, EntityConfigBase::class, TRUE)
+          || is_a($class, Config::class, TRUE)
+          || is_a($class, UserData::class, TRUE)
+          || is_a($class, ComponentEntityDisplayBase::class, TRUE);
+      };
+      $is_already_assigned = function ($existing_tags) {
+        return in_array('Configuration', $existing_tags) || in_array('Content', $existing_tags);
+      };
+      if ($is_config_class($destination['class']) && !$is_already_assigned($definition['migration_tags'])) {
         $definition['migration_tags'][] = 'Configuration';
       }
       // Default to content.
-      elseif (!in_array('Content', $definition['migration_tags'])
-        && !in_array('Configuration', $definition['migration_tags'])) {
+      elseif (!$is_already_assigned($definition['migration_tags'])) {
         $definition['migration_tags'][] = 'Content';
       }
     }