diff --git a/core/cleanup.py b/core/cleanup.py
index dd3d6ff..b95624e 100644
--- a/core/cleanup.py
+++ b/core/cleanup.py
@@ -38,7 +38,7 @@ class CleanupTimer:
             for id in list(self.alerts.iterkeys()):
                 alert = self.alerts[id]
                 if alert.expired():
-                    self.alerts.evict(id)
+                    self.alerts.delete(id)
 
             self.status = "OK"
             self.last_cleanup_time = datetime.now(pytz.UTC)