1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/storage/databases/main/metrics.py b/synapse/storage/databases/main/metrics.py
index dac3d14da8..d901933ae4 100644
--- a/synapse/storage/databases/main/metrics.py
+++ b/synapse/storage/databases/main/metrics.py
@@ -14,7 +14,7 @@
 import calendar
 import logging
 import time
-from typing import Dict
+from typing import TYPE_CHECKING, Dict
 
 from synapse.metrics import GaugeBucketCollector
 from synapse.metrics.background_process_metrics import wrap_as_background_process
@@ -24,6 +24,9 @@ from synapse.storage.databases.main.event_push_actions import (
     EventPushActionsWorkerStore,
 )
 
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
 logger = logging.getLogger(__name__)
 
 # Collect metrics on the number of forward extremities that exist.
@@ -52,7 +55,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
     stats and prometheus metrics.
     """
 
-    def __init__(self, database: DatabasePool, db_conn, hs):
+    def __init__(self, database: DatabasePool, db_conn, hs: "HomeServer"):
         super().__init__(database, db_conn, hs)
 
         # Read the extrems every 60 minutes