diff --git a/src/Plugin/Block/TocFilterBlock.php b/src/Plugin/Block/TocFilterBlock.php
index a40227db8367cd5ab95e86370aa71bbbf3e17a5e..e32f9adc3e5fb76abda7bb0ee6aed6650feff49e 100755
--- a/src/Plugin/Block/TocFilterBlock.php
+++ b/src/Plugin/Block/TocFilterBlock.php
@@ -3,6 +3,7 @@
 namespace Drupal\toc_filter\Plugin\Block;
 
 use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Access\AccessResultInterface;
 use Drupal\filter\Entity\FilterFormat;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\toc_api\Plugin\Block\TocBlockBase;
@@ -21,7 +22,7 @@ class TocFilterBlock extends TocBlockBase {
   /**
    * {@inheritdoc}
    */
-  protected function blockAccess(AccountInterface $account) {
+  protected function blockAccess(AccountInterface $account): AccessResultInterface {
     $node = $this->getCurrentNode();
 
     // If current page is not a node or does not contain a [toc] token return