diff --git a/graphapi.api.php b/graphapi.api.php
index 6bcd747..2139720 100644
--- a/graphapi.api.php
+++ b/graphapi.api.php
@@ -96,7 +96,7 @@ function hook_graphapi_default_settings() {
  * Example function: creates a graph of user logins by day.
  */
 function graphapi_API_user_last_login_by_day($n = 40) {
-  $query = db_select('users');
+  $query = \Drupal::database()->select('users');
   $query->addField('users', 'name');
   $query->addField('users', 'uid');
   $query->addField('users', 'created');