diff --git a/src/argus/incident/models.py b/src/argus/incident/models.py
index ce448dd7d..f276af776 100644
--- a/src/argus/incident/models.py
+++ b/src/argus/incident/models.py
@@ -479,7 +479,7 @@ def start_event(self):
 
     @property
     def reopen_event(self):
-        return self.all_reopen_events.last()
+        return self.all_reopen_events().last()
 
     @property
     def end_event(self):