diff --git a/python_apps/media-monitor2/media/saas/thread.py b/python_apps/media-monitor2/media/saas/thread.py
index 49a3acd6f..523d5cd94 100644
--- a/python_apps/media-monitor2/media/saas/thread.py
+++ b/python_apps/media-monitor2/media/saas/thread.py
@@ -1,7 +1,7 @@
 import threading
 
 class UserlessThread(Exception):
-    def __str__():
+    def __str__(self):
         return "Current thread: %s is not an instance of InstanceThread \
                 of InstanceInheritingThread" % str(threading.current_thread())