diff --git a/protected/models/product/ProductParameterName.php b/protected/models/product/ProductParameterName.php
index 303527c5..9612df40 100644
--- a/protected/models/product/ProductParameterName.php
+++ b/protected/models/product/ProductParameterName.php
@@ -90,7 +90,7 @@ public function defaultScope()
    */
   public function getRootId()
   {
-    return $this->findBySql("SELECT * FROM ".$this->dbConnection->schema->quoteTableName($this->tableName())." WHERE parent = id")->id;
+    return $this->find('parent = id')->id;
   }
 
   /**
@@ -319,4 +319,4 @@ public function getImage()
   {
     return 'f/upload/images/param_'.$this->id.'.png';
   }
-}
\ No newline at end of file
+}