1 files changed, 2 insertions, 3 deletions
diff --git a/synapse/storage/databases/main/room.py b/synapse/storage/databases/main/room.py
index aef08c7e12..7d3ac47261 100644
--- a/synapse/storage/databases/main/room.py
+++ b/synapse/storage/databases/main/room.py
@@ -21,8 +21,6 @@ from abc import abstractmethod
 from enum import Enum
 from typing import Any, Dict, List, Optional, Tuple
 
-from canonicaljson import json
-
 from synapse.api.constants import EventTypes
 from synapse.api.errors import StoreError
 from synapse.api.room_versions import RoomVersion, RoomVersions
@@ -30,6 +28,7 @@ from synapse.storage._base import SQLBaseStore, db_to_json
 from synapse.storage.database import DatabasePool, LoggingTransaction
 from synapse.storage.databases.main.search import SearchStore
 from synapse.types import ThirdPartyInstanceID
+from synapse.util import json_encoder
 from synapse.util.caches.descriptors import cached
 
 logger = logging.getLogger(__name__)
@@ -1310,7 +1309,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore, SearchStore):
                 "event_id": event_id,
                 "user_id": user_id,
                 "reason": reason,
-                "content": json.dumps(content),
+                "content": json_encoder.encode(content),
             },
             desc="add_event_report",
         )