diff --git a/login/signup_form.php b/login/signup_form.php
index 60713829906..83ce9fcedee 100644
--- a/login/signup_form.php
+++ b/login/signup_form.php
@@ -93,6 +93,7 @@ class login_signup_form extends moodleform {
         if ($this->signup_captcha_enabled()) {
             $mform->addElement('recaptcha', 'recaptcha_element', get_string('security_question', 'auth'), array('https' => $CFG->loginhttps));
             $mform->addHelpButton('recaptcha_element', 'recaptcha', 'auth');
+            $mform->closeHeaderBefore('recaptcha_element');
         }
 
         if (!empty($CFG->sitepolicy)) {