diff --git a/lib/fake_matrix_api.dart b/lib/fake_matrix_api.dart
index cb89faad..c78d1aae 100644
--- a/lib/fake_matrix_api.dart
+++ b/lib/fake_matrix_api.dart
@@ -1972,7 +1972,7 @@ class FakeMatrixApi extends BaseClient {
               ]
             }
           },
-      '/client/v3/sync?filter=%7B%22room%22%3A%7B%22include_leave%22%3Atrue%2C%22timeline%22%3A%7B%22limit%22%3A10%7D%7D%7D&timeout=0':
+      '/client/v3/sync?filter=%7B%22room%22%3A%7B%22include_leave%22%3Atrue%2C%22state%22%3A%7B%22lazy_load_members%22%3Atrue%7D%2C%22timeline%22%3A%7B%22limit%22%3A10%7D%7D%7D&timeout=0':
           (var req) => archiveSyncResponse,
       '/client/v3/sync?filter=1234&timeout=0': (var req) => syncResponse,
       '/client/v3/sync?filter=1234&since=1234&full_state=false&set_presence=unavailable&timeout=15':
diff --git a/lib/src/client.dart b/lib/src/client.dart
index 77fbb5f5..d842fe5d 100644
--- a/lib/src/client.dart
+++ b/lib/src/client.dart
@@ -1109,8 +1109,17 @@ class Client extends MatrixApi {
   /// [ArchivedRoom] objects containing the [Room] and the associated [Timeline].
   Future<List<ArchivedRoom>> loadArchiveWithTimeline() async {
     _archivedRooms.clear();
+
+    final filter = jsonEncode(Filter(
+      room: RoomFilter(
+        state: StateFilter(lazyLoadMembers: true),
+        includeLeave: true,
+        timeline: StateFilter(limit: 10),
+      ),
+    ).toJson());
+
     final syncResp = await sync(
-      filter: '{"room":{"include_leave":true,"timeline":{"limit":10}}}',
+      filter: filter,
       timeout: _archiveCacheBusterTimeout,
       setPresence: syncPresence,
     );