diff --git a/lib/weblib.php b/lib/weblib.php
index 858d82e6cd2..468bf4dbcb2 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -3662,5 +3662,5 @@ function get_formatted_help_string($identifier, $component, $ajax = false, $a =
  * @return string HTML to prevent password autofill
  */
 function prevent_form_autofill_password() {
-    return '<div class="hide"><input type="text" /><input type="password" /></div>';
+    return '<div class="hide"><input type="text" class="ignoredirty" /><input type="password" class="ignoredirty" /></div>';
 }