diff --git a/models.py b/models.py
index 4a4eaf5..c9dabd6 100644
--- a/models.py
+++ b/models.py
@@ -239,7 +239,7 @@ class ParticipationRequest(SQLModel, table=True):
         else:
             raise Exception("Unknown old state " + str(self.state) + ".")
 
-    def try_reject(self, now: datetime.datetime) -> Result[RejectInTime, RejectAfterAccept | RejectAfterTimeout]:
+    def try_reject(self, now: datetime.datetime) -> Result[RejectInTime | RejectAfterAccept, AlreadyRejected | RejectAfterTimeout]:
         if self.state == ParticipationState.REQUESTED or self.state == ParticipationState.TIMEOUT:
             # We want to make the order in which check_for_timeout() and try_reject() is called irrelevant
             if self.is_timed_out(now):