diff --git a/plone/app/discussion/comment.py b/plone/app/discussion/comment.py
index f167a1d..1082c88 100644
--- a/plone/app/discussion/comment.py
+++ b/plone/app/discussion/comment.py
@@ -225,7 +225,7 @@ def notify_user(obj, event):
                         context=obj.REQUEST)
     message = translate(Message(
             MAIL_NOTIFICATION_MESSAGE,
-            mapping={'title': content_object.title,
+            mapping={'title': safe_unicode(content_object.title),
                      'link': content_object.absolute_url()}),
                         context=obj.REQUEST)
     for email in emails:
@@ -279,7 +279,7 @@ def notify_moderator(obj, event):
     #comment = conversation.getComments().next()
     subject = translate(_(u"A comment has been posted."), context=obj.REQUEST)
     message = translate(Message(MAIL_NOTIFICATION_MESSAGE,
-        mapping={'title': content_object.title,
+        mapping={'title': safe_unicode(content_object.title),
                  'link': content_object.absolute_url()}),
         context=obj.REQUEST)