diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index d2c209c471..a9b8088546 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -157,7 +157,7 @@ from functools import wraps
 
 from canonicaljson import json
 
-from twisted.internet import defer
+from twisted.internet import defer,
 
 from synapse.config import ConfigError