diff --git a/blog/external_blog_edit_form.php b/blog/external_blog_edit_form.php
index ba7f0cf712f..696e79af3c6 100644
--- a/blog/external_blog_edit_form.php
+++ b/blog/external_blog_edit_form.php
@@ -37,11 +37,13 @@ class blog_edit_external_form extends moodleform {
 
         $mform =& $this->_form;
 
-        $mform->addElement('text', 'url', get_string('url', 'blog'), array('size' => 50));
+        $mform->addElement('url', 'url', get_string('url', 'blog'), array('size' => 50));
+        $mform->setType('url', PARAM_URL);
         $mform->addRule('url', get_string('emptyurl', 'blog'), 'required', null, 'client');
         $mform->addHelpButton('url', 'url', 'blog');
 
         $mform->addElement('text', 'name', get_string('name', 'blog'));
+        $mform->setType('name', PARAM_TEXT);
         $mform->addHelpButton('name', 'name', 'blog');
 
         $mform->addElement('textarea', 'description', get_string('description', 'blog'), array('cols' => 50, 'rows' => 7));
@@ -49,8 +51,10 @@ class blog_edit_external_form extends moodleform {
 
         if (!empty($CFG->usetags)) {
             $mform->addElement('text', 'filtertags', get_string('filtertags', 'blog'), array('size' => 50));
+            $mform->setType('filtertags', PARAM_TAGLIST);
             $mform->addHelpButton('filtertags', 'filtertags', 'blog');
             $mform->addElement('text', 'autotags', get_string('autotags', 'blog'), array('size' => 50));
+            $mform->setType('autotags', PARAM_TAGLIST);
             $mform->addHelpButton('autotags', 'autotags', 'blog');
         }