diff --git a/app/views/cards/comments/_comment.html.erb b/app/views/cards/comments/_comment.html.erb
index 2f8a120a0..f01a9df91 100644
--- a/app/views/cards/comments/_comment.html.erb
+++ b/app/views/cards/comments/_comment.html.erb
@@ -1,6 +1,6 @@
 <% cache comment do %>
   <%# Helper Dependency Updated: avatar_image_tag 2025-12-15 %>
-  <%= turbo_frame_tag comment, :container, class: ["comment--system": comment.creator.system?] do %>
+  <%= turbo_frame_tag comment, :container, class: { "comment--system": comment.creator.system? } do %>
     <%# Cache bump 2025-12-14: action text attachment rendering changed for lightbox -%>
     <div id="<%= dom_id(comment) %>" data-creator-id="<%= comment.creator_id %>"  class="comment align-start full-width">
       <figure class="comment__avatar flex-item-no-shrink" aria-hidden="true">