diff --git a/add_form.php b/add_form.php
index 197af86..baab1d3 100644
--- a/add_form.php
+++ b/add_form.php
@@ -44,12 +44,14 @@ class mod_attendance_add_form extends moodleform {
                                   get_string('commonsession', 'attendance'));
                 $mform->addHelpButton('sessiontypedescription', 'sessiontype', 'attendance');
                 $mform->addElement('hidden', 'sessiontype', attendance::SESSION_COMMON);
+                $mform->setType('sessiontype', PARAM_INT);
                 break;
             case SEPARATEGROUPS:
                 $mform->addElement('static', 'sessiontypedescription', get_string('sessiontype', 'attendance'),
                                   get_string('groupsession', 'attendance'));
                 $mform->addHelpButton('sessiontypedescription', 'sessiontype', 'attendance');
                 $mform->addElement('hidden', 'sessiontype', attendance::SESSION_GROUP);
+                $mform->setType('sessiontype', PARAM_INT);
                 break;
             case VISIBLEGROUPS:
                 $radio=array();
@@ -58,6 +60,7 @@ class mod_attendance_add_form extends moodleform {
                 $radio[] = &$mform->createElement('radio', 'sessiontype', '',
                                                   get_string('groupsession', 'attendance'), attendance::SESSION_GROUP);
                 $mform->addGroup($radio, 'sessiontype', get_string('sessiontype', 'attendance'), ' ', false);
+                $mform->setType('sessiontype', PARAM_INT);
                 $mform->addHelpButton('sessiontype', 'sessiontype', 'attendance');
                 $mform->setDefault('sessiontype', attendance::SESSION_COMMON);
                 break;
diff --git a/export_form.php b/export_form.php
index e9eee31..98db6a7 100644
--- a/export_form.php
+++ b/export_form.php
@@ -51,9 +51,12 @@ class mod_attendance_export_form extends moodleform {
 
         $ident = array();
         $ident[] =& $mform->createElement('checkbox', 'id', '', get_string('studentid', 'attendance'));
+
         $ident[] =& $mform->createElement('checkbox', 'uname', '', get_string('username'));
         $mform->addGroup($ident, 'ident', get_string('identifyby', 'attendance'), array('<br />'), true);
         $mform->setDefaults(array('ident[id]' => true, 'ident[uname]' => true));
+        $mform->setType('id', PARAM_INT);
+        $mform->setType('uname', PARAM_INT);
 
         $mform->addElement('checkbox', 'includeallsessions', get_string('includeall', 'attendance'), get_string('yes'));
         $mform->setDefault('includeallsessions', true);