diff --git a/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php b/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php
index 871963ee655..940e0c35e25 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php
@@ -1525,9 +1525,6 @@ public function addAttributeToSort($attribute, $dir = self::SORT_ORDER_ASC)
                 $this->getSelect()->order($this->_getAttributeFieldName($attribute) . ' ' . $dir);
                 return $this;
             }
-            if ($this->isEnabledFlat()) {
-                $this->getSelect()->order("cat_index_position {$dir}");
-            }
             // optimize if using cat index
             $filters = $this->_productLimitationFilters;
             if (isset($filters['category_id']) || isset($filters['visibility'])) {