diff --git a/libraries/src/Form/Rule/EmailRule.php b/libraries/src/Form/Rule/EmailRule.php
index 29eedf1045e56..9869d67a012e7 100644
--- a/libraries/src/Form/Rule/EmailRule.php
+++ b/libraries/src/Form/Rule/EmailRule.php
@@ -29,7 +29,7 @@ class EmailRule extends FormRule
 	 *
 	 * @var    string
 	 * @since  1.7.0
-	 * @link   http://www.w3.org/TR/html-markup/input.email.html
+	 * @link   https://www.w3.org/TR/html/sec-forms.html#email-state-typeemail
 	 */
 	protected $regex = "^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])"
 			. "?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$";