diff --git a/src/Plugin/Field/FieldFormatter/TypedResourceObjectStringFormatter.php b/src/Plugin/Field/FieldFormatter/TypedResourceObjectStringFormatter.php
index 688d8d121cb3d405e4e71d721d958f376a220c8c..20eb542f70df9ccc2cb7db575c42a18310c7ac17 100644
--- a/src/Plugin/Field/FieldFormatter/TypedResourceObjectStringFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/TypedResourceObjectStringFormatter.php
@@ -24,13 +24,6 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
  */
 class TypedResourceObjectStringFormatter extends FormatterBase implements ContainerFactoryPluginInterface {
 
-  /**
-   * The JSON:API reference client.
-   *
-   * @var \Drupal\jsonapi_reference\JsonApiClientInterface
-   */
-  protected $jsonapiClient;
-
   /**
    * Constructs a new TypedResourceObjectStringFormatter.
    *
@@ -51,7 +44,7 @@ class TypedResourceObjectStringFormatter extends FormatterBase implements Contai
    * @param \Drupal\jsonapi_reference\JsonApiClientInterface $jsonapi_client
    *   The JSON:API reference client.
    */
-  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, $label, $view_mode, array $third_party_settings, JsonApiClientInterface $jsonapi_client) {
+  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, $label, $view_mode, array $third_party_settings, protected JsonApiClientInterface $jsonapi_client) {
     parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $label, $view_mode, $third_party_settings);
 
     $this->jsonapiClient = $jsonapi_client;