diff --git a/synapse/rest/media/v1/thumbnail_resource.py b/synapse/rest/media/v1/thumbnail_resource.py

index aae6e464e8..5305e9175f 100644
--- a/synapse/rest/media/v1/thumbnail_resource.py
+++ b/synapse/rest/media/v1/thumbnail_resource.py
@@ -20,13 +20,14 @@ from twisted.internet import defer
 from twisted.web.resource import Resource
 from twisted.web.server import NOT_DONE_YET
 
-from synapse.http.server import (
-    set_cors_headers,
-    wrap_json_request_handler,
-)
+from synapse.http.server import set_cors_headers, wrap_json_request_handler
 from synapse.http.servlet import parse_integer, parse_string
+
 from ._base import (
-    FileInfo, parse_media_id, respond_404, respond_with_file,
+    FileInfo,
+    parse_media_id,
+    respond_404,
+    respond_with_file,
     respond_with_responder,
 )