diff --git a/src/Exceptions.php b/src/Exceptions.php
index c7c7a07..7446781 100644
--- a/src/Exceptions.php
+++ b/src/Exceptions.php
@@ -34,6 +34,8 @@ class DuplicateUsernameException extends AuthException {}
 
 class AmbiguousUsernameException extends AuthException {}
 
+class AttemptCancelledException extends AuthException {}
+
 class AuthError extends \Exception {}
 
 class DatabaseError extends AuthError {}