diff --git a/synapse/storage/database.py b/synapse/storage/database.py
index 92b3c77b6d..da6473ea28 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -59,10 +59,10 @@ from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage.background_updates import BackgroundUpdater
from synapse.storage.engines import (
BaseDatabaseEngine,
+ PostgresEngine,
Psycopg2Engine,
PsycopgEngine,
Sqlite3Engine,
- PostgresEngine,
)
from synapse.storage.types import Connection, Cursor, SQLQueryParameters
from synapse.util.async_helpers import delay_cancellation
diff --git a/synapse/storage/databases/main/event_federation.py b/synapse/storage/databases/main/event_federation.py
index 98556a0523..b5d00348a6 100644
--- a/synapse/storage/databases/main/event_federation.py
+++ b/synapse/storage/databases/main/event_federation.py
@@ -47,7 +47,7 @@ from synapse.storage.database import (
)
from synapse.storage.databases.main.events_worker import EventsWorkerStore
from synapse.storage.databases.main.signatures import SignatureWorkerStore
-from synapse.storage.engines import PostgresEngine, Psycopg2Engine, Sqlite3Engine
+from synapse.storage.engines import PostgresEngine, Sqlite3Engine
from synapse.types import JsonDict, StrCollection
from synapse.util import json_encoder
from synapse.util.caches.descriptors import cached
diff --git a/synapse/storage/databases/main/relations.py b/synapse/storage/databases/main/relations.py
index d0bc78b2e3..cf3ea28a3a 100644
--- a/synapse/storage/databases/main/relations.py
+++ b/synapse/storage/databases/main/relations.py
@@ -47,8 +47,6 @@ from synapse.storage.databases.main.stream import (
generate_pagination_where_clause,
)
from synapse.storage.engines import PostgresEngine, Psycopg2Engine
-from synapse.types import JsonDict, StreamKeyType, StreamToken
-from synapse.storage.engines import PostgresEngine
from synapse.types import JsonDict, MultiWriterStreamToken, StreamKeyType, StreamToken
from synapse.util.caches.descriptors import cached, cachedList
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