diff --git a/apps/calendar/ajax/events.php b/apps/calendar/ajax/events.php
index 8618d4a49f00d8b5916e21029966dc1c5471a52a..e00e0cfeb1ea41471b0fb6d6f622de589a6a2c5c 100644
--- a/apps/calendar/ajax/events.php
+++ b/apps/calendar/ajax/events.php
@@ -27,7 +27,7 @@ else {
 
 $start = (version_compare(PHP_VERSION, '5.3.0', '>='))?DateTime::createFromFormat('U', $_GET['start']):new DateTime('@' . $_GET['start']);
 $end = (version_compare(PHP_VERSION, '5.3.0', '>='))?DateTime::createFromFormat('U', $_GET['end']):new DateTime('@' . $_GET['end']);
-$events = OC_Calendar_App::getrequestedEvents($calendar_id, $start, $end);
+$events = OC_Calendar_App::getrequestedEvents($_GET['calendar_id'], $start, $end);
 $output = array();
 foreach($events as $event){
 	$output = array_merge($output, OC_Calendar_App::generateEventOutput($event, $start, $end));