diff --git a/lib/fitlien_common.dart b/lib/fitlien_common.dart
index b3e7d61..23a8906 100644
--- a/lib/fitlien_common.dart
+++ b/lib/fitlien_common.dart
@@ -6,6 +6,7 @@ class InvitationStatus {
   static const String completed = 'COMPLETED';
   static const String failed = 'FAILED';
   static const String timeout = 'TIMEOUT';
+  static const String expired = 'EXPIRED';
 }
 
 class CollectionNames {