diff --git a/calendar/preferences.php b/calendar/preferences.php
index a36c9f3249b..165466d6479 100644
--- a/calendar/preferences.php
+++ b/calendar/preferences.php
@@ -9,7 +9,7 @@ require_once($CFG->dirroot.'/calendar/preferences_form.php');
 $courseid = required_param('course', PARAM_INT);
 $course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
 
-$PAGE->set_url('/calendar/preferences.php', array('id' => $courseid));
+$PAGE->set_url(new moodle_url('/calendar/preferences.php', array('course' => $courseid)));
 $PAGE->set_pagelayout('standard');
 
 require_login($course);
@@ -37,10 +37,13 @@ $prefs->maxevents  = get_user_preferences('calendar_maxevents', $defaultmaxevent
 $prefs->lookahead  = get_user_preferences('calendar_lookahead', $defaultlookahead);
 $prefs->persistflt = get_user_preferences('calendar_persistflt', 0);
 
-$form = new calendar_preferences_form();
+$form = new calendar_preferences_form($PAGE->url);
 $form->set_data($prefs);
 
-if ($data = $form->get_data() && confirm_sesskey()) {
+if ($form->is_cancelled()) {
+    redirect($viewurl);
+} else if ($form->is_submitted() && $form->is_validated() && confirm_sesskey()) {
+    $data = $form->get_data();
     if ($data->timeformat != CALENDAR_TF_12 && $data->timeformat != CALENDAR_TF_24) {
         $data->timeformat = '';
     }
@@ -68,7 +71,7 @@ if ($data = $form->get_data() && confirm_sesskey()) {
 $strcalendar = get_string('calendar', 'calendar');
 $strpreferences = get_string('calendarpreferences', 'calendar');
 
-$PAGE->navbar->add($strpreferences, new moodle_url('/calendar/view.php'));
+$PAGE->navbar->add($strpreferences);
 $PAGE->set_pagelayout('admin');
 $PAGE->set_title("$course->shortname: $strcalendar: $strpreferences");
 $PAGE->set_heading($course->fullname);