diff --git a/src/test/helpers.py b/src/test/helpers.py
index eb74afc6..d2e30dee 100644
--- a/src/test/helpers.py
+++ b/src/test/helpers.py
@@ -19,13 +19,14 @@
 
 import __builtin__
 from twisted.words.protocols.jabber.jid import JID
+from twisted.trial.unittest import FailTest
 
 TEST_JID_STR = u"test@example.org/SàT"
 TEST_JID = JID(u"test@example.org/SàT")
 TEST_PROFILE = 'test_profile'
 
 
-class DifferentArgsException(Exception):
+class DifferentArgsException(FailTest):
     pass