diff --git a/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php b/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php
index 2410990..8b3dc95 100644
--- a/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php
+++ b/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php
@@ -316,7 +316,7 @@ protected function preSaveNew(EntityStorageControllerInterface $storage_controll
     }
 
     // Disallow reserved field names.
-    $disallowed_field_names = array_keys($entity_manager->getFieldDefinitions($this->entity_type));
+    $disallowed_field_names = array_keys($entity_manager->getBaseFieldDefinitions($this->entity_type));
     if (in_array($this->name, $disallowed_field_names)) {
       throw new FieldException(format_string('Attempt to create field %name which is reserved by entity type %type.', array('%name' => $this->name, '%type' => $this->entity_type)));
     }