diff --git a/lib/src/matrix_api.dart b/lib/src/matrix_api.dart
index f0fd488f..6eccfbac 100644
--- a/lib/src/matrix_api.dart
+++ b/lib/src/matrix_api.dart
@@ -29,9 +29,6 @@ import 'package:http/http.dart' as http;
 
 import '../matrix_api_lite.dart';
 import 'generated/api.dart';
-import 'model/matrix_connection_exception.dart';
-import 'model/matrix_exception.dart';
-import 'model/matrix_keys.dart';
 
 enum RequestType { GET, POST, PUT, DELETE }
 
diff --git a/lib/src/model/event_types.dart b/lib/src/model/event_types.dart
index 58c80899..b948c8a2 100644
--- a/lib/src/model/event_types.dart
+++ b/lib/src/model/event_types.dart
@@ -57,6 +57,8 @@ abstract class EventTypes {
   static const String CallAssertedIdentity = 'm.call.asserted_identity';
   static const String CallAssertedIdentityPrefix =
       'org.matrix.call.asserted_identity';
+  static const String GroupCallPrefix = 'org.matrix.msc3401.call';
+  static const String GroupCallMemberPrefix = 'org.matrix.msc3401.call.member';
   static const String Unknown = 'm.unknown';
 
   // To device event types