diff --git a/vendor/magento/module-catalog/Model/ResourceModel/Category/AggregateCount.php b/vendor/magento/module-catalog/Model/ResourceModel/Category/AggregateCount.php
index fab2441db26..939f9d354af 100644
--- a/vendor/magento/module-catalog/Model/ResourceModel/Category/AggregateCount.php
+++ b/vendor/magento/module-catalog/Model/ResourceModel/Category/AggregateCount.php
@@ -8,11 +8,15 @@ namespace Magento\Catalog\Model\ResourceModel\Category;
 use Magento\Catalog\Model\Category;
 
 /**
+ * Aggregate count for parent category after deleting child category
+ *
  * Class AggregateCount
  */
 class AggregateCount
 {
     /**
+     * Reduces children count for parent categories
+     *
      * @param Category $category
      * @return void
      */
@@ -25,9 +29,7 @@ class AggregateCount
          */
         $parentIds = $category->getParentIds();
         if ($parentIds) {
-            $childDecrease = $category->getChildrenCount() + 1;
-            // +1 is itself
-            $data = ['children_count' => new \Zend_Db_Expr('children_count - ' . $childDecrease)];
+            $data = ['children_count' => new \Zend_Db_Expr('children_count - 1')];
             $where = ['entity_id IN(?)' => $parentIds];
             $resourceModel->getConnection()->update($resourceModel->getEntityTable(), $data, $where);
         }