diff --git a/app/views/fluentd/settings/histories/show.html.haml b/app/views/fluentd/settings/histories/show.html.haml
index 27f7899..93b2186 100644
--- a/app/views/fluentd/settings/histories/show.html.haml
+++ b/app/views/fluentd/settings/histories/show.html.haml
@@ -1,6 +1,6 @@
 - page_title t('.page_title', label: @fluentd.label)
 
-%p{class: "pull-right"}
+%p.pull-right
   = link_to configtest_daemon_setting_history_path(id: @backup_file.file_id), method: "post", class: "btn btn-default" do
     = icon('fa-legal')
     = t("terms.configtest")