diff --git a/awx/plugins/callback/job_event_callback.py b/awx/plugins/callback/job_event_callback.py
index 81c6a40062..2026f0c410 100644
--- a/awx/plugins/callback/job_event_callback.py
+++ b/awx/plugins/callback/job_event_callback.py
@@ -212,7 +212,7 @@ class BaseCallbackModule(object):
 
     def _log_event(self, event, **event_data):
         if self.callback_consumer_port:
-            with statsd.timer('zmq_post_event_msg.{}'.format(event)):
+            with statsd.timer('zmq_post_event_msg.{0}'.format(event)):
                 self._post_job_event_queue_msg(event, event_data)
         else:
             self._post_rest_api_event(event, event_data)