diff --git a/core/themes/classy/templates/content-edit/filter-guidelines.html.twig b/core/themes/classy/templates/content-edit/filter-guidelines.html.twig
index 783992bece2d91cf44d47c7390654365c77ebf5a..9459c1aec950d090695ee67d4cb4decde06ee344 100644
--- a/core/themes/classy/templates/content-edit/filter-guidelines.html.twig
+++ b/core/themes/classy/templates/content-edit/filter-guidelines.html.twig
@@ -22,7 +22,7 @@
 {%
   set classes = [
     'filter-guidelines-item',
-    'filter-guidelines-' ~ format.format,
+    'filter-guidelines-' ~ format.id,
   ]
 %}
 <div{{ attributes.addClass(classes) }}>