diff --git a/plone/app/discussion/browser/comments.py b/plone/app/discussion/browser/comments.py
index ae460db..ec1737b 100644
--- a/plone/app/discussion/browser/comments.py
+++ b/plone/app/discussion/browser/comments.py
@@ -53,18 +53,6 @@ def commentButtonActionFactory(request, field):
     return button
 
 
-class CancelButtonAction(button.ButtonAction):
-    """Cancel button with Plone CSS style.
-    """
-
-def cancelButtonActionFactory(request, field):
-    """Cancel button action factory.
-    """
-    button = CancelButtonAction(request, field)
-    button.klass += " standalone hide"
-    return button
-
-
 class CommentForm(extensible.ExtensibleForm, form.Form):
 
     ignoreContext = True # don't use context to get widget data
@@ -88,7 +76,6 @@ class CommentForm(extensible.ExtensibleForm, form.Form):
             self.widgets['author_name'].mode = interfaces.HIDDEN_MODE
             self.widgets['author_email'].mode = interfaces.HIDDEN_MODE
         self.buttons['comment'].actionFactory = commentButtonActionFactory
-        self.buttons['cancel'].actionFactory = cancelButtonActionFactory
 
         # XXX: Since we are not using the author_email field in the
         # current state, we hide it by default. But we keep the field for