diff --git a/src/Plugin/Purge/DiagnosticCheck/PageCacheCheck.php b/src/Plugin/Purge/DiagnosticCheck/PageCacheCheck.php
deleted file mode 100644
index 4a85df7..0000000
--- a/src/Plugin/Purge/DiagnosticCheck/PageCacheCheck.php
+++ /dev/null
@@ -1,74 +0,0 @@
-<?php
-
-namespace Drupal\purge\Plugin\Purge\DiagnosticCheck;
-
-use Symfony\Component\DependencyInjection\ContainerInterface;
-use Drupal\Core\Extension\ModuleHandlerInterface;
-use Drupal\purge\Plugin\Purge\DiagnosticCheck\DiagnosticCheckInterface;
-use Drupal\purge\Plugin\Purge\DiagnosticCheck\DiagnosticCheckBase;
-
-/**
- * Tests if the page_cache module is installed.
- *
- * @PurgeDiagnosticCheck(
- *   id = "page_cache",
- *   title = @Translation("Page cache"),
- *   description = @Translation("Tests if the page_cache module is installed."),
- *   dependent_queue_plugins = {},
- *   dependent_purger_plugins = {}
- * )
- */
-class PageCacheCheck extends DiagnosticCheckBase implements DiagnosticCheckInterface {
-
-  /**
-   * The module handler.
-   *
-   * @var \Drupal\Core\Extension\ModuleHandlerInterface
-   */
-  protected $moduleHandler;
-
-  /**
-   * Constructs a \Drupal\purge\Plugin\Purge\DiagnosticCheck\PerformanceSettingsCheck object.
-   *
-   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
-   *   The module handler.
-   * @param array $configuration
-   *   A configuration array containing information about the plugin instance.
-   * @param string $plugin_id
-   *   The plugin_id for the plugin instance.
-   * @param mixed $plugin_definition
-   *   The plugin implementation definition.
-   */
-  public function __construct(ModuleHandlerInterface $module_handler, array $configuration, $plugin_id, $plugin_definition) {
-    parent::__construct($configuration, $plugin_id, $plugin_definition);
-    $this->moduleHandler = $module_handler;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
-    return new static(
-      $container->get('module_handler'),
-      $configuration,
-      $plugin_id,
-      $plugin_definition
-    );
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function run() {
-    $this->value = $this->t('installed');
-
-    // Test for the page_cache module, which is required for cache invalidation.
-    if (!$this->moduleHandler->moduleExists('page_cache')) {
-      $this->value = '';
-      $this->recommendation = $this->t("Please install the page_cache module. The page cache acts as a 'second layer of defence' by keeping copies of all generated pages, which protects you from widespread performance degradation in case of emergencies.");
-      return SELF::SEVERITY_WARNING;
-    }
-    return SELF::SEVERITY_OK;
-  }
-
-}