diff --git a/lib/internal/Magento/Framework/Data/SearchResultProcessor.php b/lib/internal/Magento/Framework/Data/SearchResultProcessor.php
index 5321ce06755cf..fc7cc2f98a1ef 100644
--- a/lib/internal/Magento/Framework/Data/SearchResultProcessor.php
+++ b/lib/internal/Magento/Framework/Data/SearchResultProcessor.php
@@ -188,8 +188,8 @@ public function toArray($arrRequiredFields = [])
     }
 
     /**
-     * @param null $valueField
-     * @param null $labelField
+     * @param string|null $valueField
+     * @param string|null $labelField
      * @param array $additional
      * @return array
      */