diff --git a/synapse/state/__init__.py b/synapse/state/__init__.py
index c0f79ffdc8..b3bd92d37c 100644
--- a/synapse/state/__init__.py
+++ b/synapse/state/__init__.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
@@ -20,6 +19,7 @@ from typing import (
Any,
Awaitable,
Callable,
+ Collection,
DefaultDict,
Dict,
FrozenSet,
@@ -47,7 +47,7 @@ from synapse.logging.utils import log_function
from synapse.state import v1, v2
from synapse.storage.databases.main.events_worker import EventRedactBehaviour
from synapse.storage.roommember import ProfileInfo
-from synapse.types import Collection, StateMap
+from synapse.types import StateMap
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.util.metrics import Measure, measure_func
diff --git a/synapse/state/v1.py b/synapse/state/v1.py
index ce255da6fd..318e998813 100644
--- a/synapse/state/v1.py
+++ b/synapse/state/v1.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/synapse/state/v2.py b/synapse/state/v2.py
index e73a548ee4..008644cd98 100644
--- a/synapse/state/v2.py
+++ b/synapse/state/v2.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
@@ -19,6 +18,7 @@ import logging
from typing import (
Any,
Callable,
+ Collection,
Dict,
Generator,
Iterable,
@@ -38,7 +38,7 @@ from synapse.api.constants import EventTypes
from synapse.api.errors import AuthError
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.events import EventBase
-from synapse.types import Collection, MutableStateMap, StateMap
+from synapse.types import MutableStateMap, StateMap
from synapse.util import Clock
logger = logging.getLogger(__name__)
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