diff --git a/src/Users/Users.php b/src/Users/Users.php
index 7e9e091..b19edfa 100644
--- a/src/Users/Users.php
+++ b/src/Users/Users.php
@@ -144,7 +144,7 @@ class Users {
             $query .= sprintf(' %s user_birthdate LIKE ?', ++$args > 1 ? 'AND' : 'WHERE');
         if($hasOrderBy) {
             $query .= sprintf(' ORDER BY %s', $orderBy[0]);
-            if($orderBy !== null)
+            if($orderBy[1] !== null)
                 $query .= ' ' . ($orderBy[1] ? 'DESC' : 'ASC');
         }
         if($hasPagination)