diff --git a/src/plugins/plugin_misc_account.py b/src/plugins/plugin_misc_account.py
index bde056f2..39c7d8b2 100755
--- a/src/plugins/plugin_misc_account.py
+++ b/src/plugins/plugin_misc_account.py
@@ -22,6 +22,7 @@ from sat.core import exceptions
 from twisted.internet import reactor, defer, protocol
 from os.path import join, dirname
 from twisted.python.procutils import which
+from twisted.python.failure import Failure
 from email.mime.text import MIMEText
 from twisted.mail.smtp import sendmail
 
@@ -73,7 +74,7 @@ class ProsodyRegisterProtocol(protocol.ProcessProtocol):
             self.deferred.callback(None)
         else:
             error(_(u"Can't register Prosody account (error code: %(code)d): %(message)s") % {'code': reason.value.exitCode, 'message': self.data})
-            self.deferred.errback("INTERNAL")
+            self.deferred.errback(Failure(u"INTERNAL"))
 
 
 class MiscAccount(object):
@@ -108,7 +109,7 @@ class MiscAccount(object):
             raise exceptions.DataError
 
         if profile.lower() in RESERVED:
-            return defer.fail('CONFLICT')
+            return defer.fail(Failure(u'CONFLICT'))
 
         d = self.host.memory.asyncCreateProfile(profile)
         d.addCallback(self._profileRegistered, email, password, profile)