diff --git a/app/views/relationable/_related_content.html.erb b/app/views/relationable/_related_content.html.erb
index 698eb3308..96353b754 100644
--- a/app/views/relationable/_related_content.html.erb
+++ b/app/views/relationable/_related_content.html.erb
@@ -5,7 +5,7 @@
       <%= t("related_content.title") %>&nbsp;<span>(<%= relationable.relationed_contents.count %>)</span>
     </h2>
     <% if current_user %>
-      <button type="button" data-toggle="related_content" class="add-related-content" id="add-related-content">
+      <button type="button" data-toggle="related_content" class="add-related-content">
         <%= t("related_content.add") %>
       </button>
     <% end %>