diff --git a/changelog.d/13506.bugfix b/changelog.d/13506.bugfix
new file mode 100644
index 0000000000000000000000000000000000000000..2e43668865b922ea27e6f540631e7c46c63dcb4c
--- /dev/null
+++ b/changelog.d/13506.bugfix
@@ -0,0 +1 @@
+Fix a bug introduced in Synapse v1.41.0 where the `/hierarchy` API returned non-standard information (a `room_id` field under each entry in `children_state`).
\ No newline at end of file
diff --git a/synapse/handlers/room_summary.py b/synapse/handlers/room_summary.py
index 732b0310bcd64f0702e22f006d0e113530e31ec0..ebd445adcaf3d0403b4287bc7ea8ac9d0c1fc13b 100644
--- a/synapse/handlers/room_summary.py
+++ b/synapse/handlers/room_summary.py
@@ -453,7 +453,6 @@ class RoomSummaryHandler:
                 "type": e.type,
                 "state_key": e.state_key,
                 "content": e.content,
-                "room_id": e.room_id,
                 "sender": e.sender,
                 "origin_server_ts": e.origin_server_ts,
             }