diff --git a/Classes/Controller/Cart/ProductController.php b/Classes/Controller/Cart/ProductController.php
index b8828ddc..e980fd1c 100644
--- a/Classes/Controller/Cart/ProductController.php
+++ b/Classes/Controller/Cart/ProductController.php
@@ -104,7 +104,7 @@ public function addAction(): ResponseInterface
         );
 
         $pageType = $GLOBALS['TYPO3_REQUEST']->getAttribute('routing')->getPageType();
-        if ($pageType === self::AJAX_CART_TYPE_NUM) {
+        if ($pageType === static::AJAX_CART_TYPE_NUM) {
             $productsChanged = $this->getChangedProducts($cartProducts);
 
             $response = [