diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index 78b9fffbfb..7a3c805cc5 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -388,15 +388,13 @@ def only_if_tracing(func: Callable[P, R]) -> Callable[P, Optional[R]]:
@overload
def ensure_active_span(
message: str,
-) -> Callable[[Callable[P, R]], Callable[P, Optional[R]]]:
- ...
+) -> Callable[[Callable[P, R]], Callable[P, Optional[R]]]: ...
@overload
def ensure_active_span(
message: str, ret: T
-) -> Callable[[Callable[P, R]], Callable[P, Union[T, R]]]:
- ...
+) -> Callable[[Callable[P, R]], Callable[P, Union[T, R]]]: ...
def ensure_active_span(
|