diff --git a/pyproject.toml b/pyproject.toml
index 95f7be1c22..f279365faa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -96,6 +96,7 @@ select = [
     "ANN", # annotations
     "B", # bugbear
     "C4", # comprehensions
+    "COM", # trailing comma
     "DJ", # Django
     "DTZ", # naive datetime
     "E", # style errors
@@ -129,6 +130,7 @@ ignore = [
     "B023", # Function definition does not bind loop variable
     "B904", # Within an except clause, raise exceptions with raise ... from err or raise ... from None to distinguish them from errors in exception handling
     "C408", # Unnecessary `dict` call (rewrite as a literal)
+    "COM812", # Trailing comma missing
     "DJ001", # Avoid using `null=True` on string-based fields
     "DJ008", # Model does not define `__str__` method
     "E402", # Module level import not at top of file
diff --git a/zerver/management/commands/runtornado.py b/zerver/management/commands/runtornado.py
index e74ea0d969..51457414e8 100644
--- a/zerver/management/commands/runtornado.py
+++ b/zerver/management/commands/runtornado.py
@@ -79,12 +79,12 @@ class Command(BaseCommand):
                     stop_fut.set_result(None)
 
             def add_signal_handlers() -> None:
-                loop.add_signal_handler(signal.SIGINT, stop),
-                loop.add_signal_handler(signal.SIGTERM, stop),
+                loop.add_signal_handler(signal.SIGINT, stop)
+                loop.add_signal_handler(signal.SIGTERM, stop)
 
             def remove_signal_handlers() -> None:
-                loop.remove_signal_handler(signal.SIGINT),
-                loop.remove_signal_handler(signal.SIGTERM),
+                loop.remove_signal_handler(signal.SIGINT)
+                loop.remove_signal_handler(signal.SIGTERM)
 
             async with AsyncExitStack() as stack:
                 stack.push_async_callback(