diff --git a/django/contrib/comments/templates/comments/preview.html b/django/contrib/comments/templates/comments/preview.html
index dc4326b5421..8c7a434b181 100644
--- a/django/contrib/comments/templates/comments/preview.html
+++ b/django/contrib/comments/templates/comments/preview.html
@@ -12,7 +12,7 @@
     <h1>{% trans "Preview your comment" %}</h1>
       <blockquote>{{ comment|linebreaks }}</blockquote>
       <p>
-      {% trans "and" %} <input type="submit" name="submit" value="{% trans "Post your comment" %}" id="submit" /> {% trans "or make changes" %}:
+      {% trans "and" %} <input type="submit" name="submit" class="submit-post" value="{% trans "Post your comment" %}" id="submit" /> {% trans "or make changes" %}:
       </p>
     {% endif %}
     {% for field in form %}