diff --git a/plone/app/discussion/browser/comments.py b/plone/app/discussion/browser/comments.py
index 8a85457..fd01790 100644
--- a/plone/app/discussion/browser/comments.py
+++ b/plone/app/discussion/browser/comments.py
@@ -47,6 +47,7 @@ except ImportError: # pragma: no cover
 class CommentForm(extensible.ExtensibleForm, form.Form):
 
     ignoreContext = True # don't use context to get widget data
+    id = "comment-form"
     label = _(u"Add a comment")
     fields = field.Fields(IComment).omit('portal_type',
                                          '__parent__',