diff --git a/plinth/templates/form.html b/plinth/templates/form.html
index ae21f928a..18a35ba59 100644
--- a/plinth/templates/form.html
+++ b/plinth/templates/form.html
@@ -10,7 +10,7 @@
 
   <h3>{{ title }}</h3>
 
-  <form class="form" method="post">
+  <form class="form form-{{ form.prefix }}" method="post">
     {% csrf_token %}
 
     {{ form|bootstrap }}