diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index 2d44f15da3..9e017116a9 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -23,7 +23,7 @@ from synapse.api.constants import EventTypes
from synapse.api.errors import FederationDeniedError
from synapse.types import RoomStreamToken, get_domain_from_id
from synapse.util import stringutils
-from synapse.util.async import Linearizer
+from synapse.util.async_helpers import Linearizer
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.util.metrics import measure_func
from synapse.util.retryutils import NotRetryingDestination
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 0dffd44e22..2380d17f4e 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -52,7 +52,7 @@ from synapse.events.validator import EventValidator
from synapse.state import resolve_events_with_factory
from synapse.types import UserID, get_domain_from_id
from synapse.util import logcontext, unwrapFirstError
-from synapse.util.async import Linearizer
+from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room
from synapse.util.frozenutils import unfreeze
from synapse.util.logutils import log_function
diff --git a/synapse/handlers/initial_sync.py b/synapse/handlers/initial_sync.py
index 40e7580a61..1fb17fd9a5 100644
--- a/synapse/handlers/initial_sync.py
+++ b/synapse/handlers/initial_sync.py
@@ -25,7 +25,7 @@ from synapse.handlers.presence import format_user_presence_state
from synapse.streams.config import PaginationConfig
from synapse.types import StreamToken, UserID
from synapse.util import unwrapFirstError
-from synapse.util.async import concurrently_execute
+from synapse.util.async_helpers import concurrently_execute
from synapse.util.caches.snapshot_cache import SnapshotCache
from synapse.util.logcontext import make_deferred_yieldable, run_in_background
from synapse.visibility import filter_events_for_client
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index bcb093ba3e..01a362360e 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -32,7 +32,7 @@ from synapse.events.utils import serialize_event
from synapse.events.validator import EventValidator
from synapse.replication.http.send_event import ReplicationSendEventRestServlet
from synapse.types import RoomAlias, UserID
-from synapse.util.async import Linearizer
+from synapse.util.async_helpers import Linearizer
from synapse.util.frozenutils import frozendict_json_encoder
from synapse.util.logcontext import run_in_background
from synapse.util.metrics import measure_func
diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py
index b2849783ed..a97d43550f 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -22,7 +22,7 @@ from synapse.api.constants import Membership
from synapse.api.errors import SynapseError
from synapse.events.utils import serialize_event
from synapse.types import RoomStreamToken
-from synapse.util.async import ReadWriteLock
+from synapse.util.async_helpers import ReadWriteLock
from synapse.util.logcontext import run_in_background
from synapse.util.stringutils import random_string
from synapse.visibility import filter_events_for_client
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 3732830194..20fc3b0323 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -36,7 +36,7 @@ from synapse.api.errors import SynapseError
from synapse.metrics import LaterGauge
from synapse.storage.presence import UserPresenceState
from synapse.types import UserID, get_domain_from_id
-from synapse.util.async import Linearizer
+from synapse.util.async_helpers import Linearizer
from synapse.util.caches.descriptors import cachedInlineCallbacks
from synapse.util.logcontext import run_in_background
from synapse.util.logutils import log_function
diff --git a/synapse/handlers/read_marker.py b/synapse/handlers/read_marker.py
index 995460f82a..32108568c6 100644
--- a/synapse/handlers/read_marker.py
+++ b/synapse/handlers/read_marker.py
@@ -17,7 +17,7 @@ import logging
from twisted.internet import defer
-from synapse.util.async import Linearizer
+from synapse.util.async_helpers import Linearizer
from ._base import BaseHandler
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 0e16bbe0ee..3526b20d5a 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -28,7 +28,7 @@ from synapse.api.errors import (
)
from synapse.http.client import CaptchaServerHttpClient
from synapse.types import RoomAlias, RoomID, UserID, create_requester
-from synapse.util.async import Linearizer
+from synapse.util.async_helpers import Linearizer
from synapse.util.threepids import check_3pid_allowed
from ._base import BaseHandler
diff --git a/synapse/handlers/room_list.py b/synapse/handlers/room_list.py
index 828229f5c3..37e41afd61 100644
--- a/synapse/handlers/room_list.py
+++ b/synapse/handlers/room_list.py
@@ -26,7 +26,7 @@ from twisted.internet import defer
from synapse.api.constants import EventTypes, JoinRules
from synapse.types import ThirdPartyInstanceID
-from synapse.util.async import concurrently_execute
+from synapse.util.async_helpers import concurrently_execute
from synapse.util.caches.descriptors import cachedInlineCallbacks
from synapse.util.caches.response_cache import ResponseCache
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 0d4a3f4677..fb94b5d7d4 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -30,7 +30,7 @@ import synapse.types
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError, Codes, SynapseError
from synapse.types import RoomID, UserID
-from synapse.util.async import Linearizer
+from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room, user_left_room
logger = logging.getLogger(__name__)
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index dff1f67dcb..6393a9674b 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -25,7 +25,7 @@ from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership
from synapse.push.clientformat import format_push_rules_for_user
from synapse.types import RoomStreamToken
-from synapse.util.async import concurrently_execute
+from synapse.util.async_helpers import concurrently_execute
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.util.caches.lrucache import LruCache
from synapse.util.caches.response_cache import ResponseCache
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