diff --git a/manual/codes/DQL (Doctrine Query Language) - SELECT queries - Aggregate values.php b/manual/codes/DQL (Doctrine Query Language) - SELECT queries - Aggregate values.php
index 2880654a5..da23897fc 100644
--- a/manual/codes/DQL (Doctrine Query Language) - SELECT queries - Aggregate values.php	
+++ b/manual/codes/DQL (Doctrine Query Language) - SELECT queries - Aggregate values.php	
@@ -6,4 +6,6 @@ $query = new Doctrine_Query();
 $query->select('u.*, COUNT(p.id) num_posts')
       ->from('User u, u.Posts p')
       ->where('u.id = ?', 1)
+      ->groupby('u.id')
+      ->execute();
 ?>