diff --git a/mod/forum/mod_form.php b/mod/forum/mod_form.php
index db2c99fd99b..f2d4b096411 100644
--- a/mod/forum/mod_form.php
+++ b/mod/forum/mod_form.php
@@ -14,6 +14,7 @@ class mod_forum_mod_form extends moodleform_mod {
         $mform->addElement('text', 'name', get_string('forumname', 'forum'), array('size'=>'64'));
 		$mform->setType('name', PARAM_TEXT);
 		$mform->addRule('name', null, 'required', null, 'client');
+        $mform->addRule('name', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');
 
         asort($FORUM_TYPES);
         $mform->addElement('select', 'type', get_string('forumtype', 'forum'), $FORUM_TYPES);
diff --git a/mod/forum/post_form.php b/mod/forum/post_form.php
index 4107f4e9d09..73052b72c18 100644
--- a/mod/forum/post_form.php
+++ b/mod/forum/post_form.php
@@ -24,6 +24,7 @@ class mod_forum_post_form extends moodleform {
 		$mform->addElement('text', 'subject', get_string('subject', 'forum'), 'size="48"');
 		$mform->setType('subject', PARAM_TEXT);
 		$mform->addRule('subject', get_string('required'), 'required', null, 'client');
+        $mform->addRule('subject', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');
 
 		$mform->addElement('htmleditor', 'message', get_string('message', 'forum'), array('cols'=>50, 'rows'=>30));
 		$mform->setType('message', PARAM_RAW);