1 files changed, 10 insertions, 4 deletions
diff --git a/synapse/logging/formatter.py b/synapse/logging/formatter.py
index c0f12ecd15..c88b8ae545 100644
--- a/synapse/logging/formatter.py
+++ b/synapse/logging/formatter.py
@@ -16,6 +16,8 @@
 import logging
 import traceback
 from io import StringIO
+from types import TracebackType
+from typing import Optional, Tuple, Type
 
 
 class LogFormatter(logging.Formatter):
@@ -28,10 +30,14 @@ class LogFormatter(logging.Formatter):
     where it was caught are logged).
     """
 
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
-    def formatException(self, ei):
+    def formatException(
+        self,
+        ei: Tuple[
+            Optional[Type[BaseException]],
+            Optional[BaseException],
+            Optional[TracebackType],
+        ],
+    ) -> str:
         sio = StringIO()
         (typ, val, tb) = ei