diff --git a/core/modules/field/src/Entity/FieldInstanceConfig.php b/core/modules/field/src/Entity/FieldInstanceConfig.php
index 6446ec8..25fd4aa 100644
--- a/core/modules/field/src/Entity/FieldInstanceConfig.php
+++ b/core/modules/field/src/Entity/FieldInstanceConfig.php
@@ -752,11 +752,4 @@ public static function loadByName($entity_type_id, $bundle, $field_name) {
     return \Drupal::entityManager()->getStorage('field_instance_config')->load($entity_type_id . '.' . $bundle . '.' . $field_name);
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getUniqueStorageIdentifier() {
-    return $this->getField()->getUniqueStorageIdentifier();
-  }
-
 }