diff --git a/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php b/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php
index 8fe1d1c..e5b1ac6 100644
--- a/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php
+++ b/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php
@@ -617,6 +617,16 @@ public function isFieldConfigurable() {
     return TRUE;
   }
 
+  /**
+   * Returns the name of the bundle this field instance is attached to.
+   *
+   * @return string
+   *   The name of the bundle this field instance is attached to.
+   */
+  public function parentBundle() {
+    return $this->bundle;
+  }
+
   /*
    * Implements the magic __sleep() method.
    *