diff --git a/src/AbstractQueryBuilder.php b/src/AbstractQueryBuilder.php
index b651f9f..0b050c8 100644
--- a/src/AbstractQueryBuilder.php
+++ b/src/AbstractQueryBuilder.php
@@ -42,7 +42,7 @@ public function build(Query $query)
 
     public function createRequest($query)
     {
-        return new Request($this, $query);
+        return new $this->db->requestClass($this, $query);
     }
 
     /**
diff --git a/src/curl/Response.php b/src/curl/Response.php
index 9dbdf59..b4e6e14 100644
--- a/src/curl/Response.php
+++ b/src/curl/Response.php
@@ -13,7 +13,7 @@
 use hiqdev\hiart\AbstractResponse;
 
 /**
- * Guzzle response implementation.
+ * cURL response implementation.
  *
  * @author Andrii Vasyliev <sol@hiqdev.com>
  */
diff --git a/src/rest/QueryBuilder.php b/src/rest/QueryBuilder.php
index c05a0d2..85a3bb0 100644
--- a/src/rest/QueryBuilder.php
+++ b/src/rest/QueryBuilder.php
@@ -10,7 +10,9 @@
 
 namespace hiqdev\hiart\rest;
 
-class QueryBuilder extends AbstractQueryBuilder
+use hiqdev\hiart\Query;
+
+class QueryBuilder extends \hiqdev\hiart\AbstractQueryBuilder
 {
     /**
      * This function is for you to provide your authentication.