diff --git a/notifier/src/notifier/__main__.py b/notifier/src/notifier/__main__.py
index 5118fcf..b0f7597 100644
--- a/notifier/src/notifier/__main__.py
+++ b/notifier/src/notifier/__main__.py
@@ -29,7 +29,7 @@ def on_event(payload: dict[str, Any]) -> None:
 if __name__ == "__main__":
     frigate_config = FrigateConfig()
     frigate_config.fetch()
-    notification_sender = NtfyNotificationSender(quiet_period=dt.timedelta(seconds=3 * 60))
+    notification_sender = NtfyNotificationSender(quiet_period=dt.timedelta(minutes=3))
     mqtt_subscriber = MQTTSubscriber(on_event, username=os.getenv("MQTT_USERNAME"), password=os.getenv("MQTT_PASSWORD"))
     mqtt_subscriber.subscribe()
 
diff --git a/notifier/src/notifier/notify/notification.py b/notifier/src/notifier/notify/notification.py
index c3c059c..800533a 100644
--- a/notifier/src/notifier/notify/notification.py
+++ b/notifier/src/notifier/notify/notification.py
@@ -1,6 +1,7 @@
 import datetime as dt
 import time
 from abc import ABC, abstractmethod
+from collections import defaultdict
 from dataclasses import dataclass
 from enum import StrEnum
 from functools import cache, cached_property
@@ -42,7 +43,8 @@ class NotificationSender[N: Notification](ABC):
 
     def send(self, notification: N) -> None:
         now = time.time()
-        last_notification_time = self._camera_to_last_notification_time.setdefault(notification.camera, 0)
+        last_notification_time = self._camera_to_last_notification_time.get(notification.camera, 0)
         if now - last_notification_time >= self._quiet_period.total_seconds():
             # Quiet period has passed since the last notification for this camera
+            self._camera_to_last_notification_time[notification.camera] = now
             self._send(notification)