diff --git a/unifi_protect_backup/event_listener.py b/unifi_protect_backup/event_listener.py
index 20c01b9..10d554c 100644
--- a/unifi_protect_backup/event_listener.py
+++ b/unifi_protect_backup/event_listener.py
@@ -3,7 +3,7 @@
 import asyncio
 import logging
 from time import sleep
-from typing import List, Optional
+from typing import List
 
 from uiprotect.api import ProtectApiClient
 from uiprotect.websocket import WebsocketState
@@ -23,7 +23,7 @@ class EventListener:
         protect: ProtectApiClient,
         detection_types: List[str],
         ignore_cameras: List[str],
-        cameras: Optional[List[str]] = None,
+        cameras: List[str],
     ):
         """Init.
 
@@ -32,7 +32,7 @@ class EventListener:
             protect (ProtectApiClient): UniFI Protect API client to use
             detection_types (List[str]): Desired Event detection types to look for
             ignore_cameras (List[str]): Cameras IDs to ignore events from
-            cameras (Optional[List[str]]): Cameras IDs to ONLY include events from
+            cameras (List[str]): Cameras IDs to ONLY include events from
         """
         self._event_queue: asyncio.Queue = event_queue
         self._protect: ProtectApiClient = protect
@@ -40,7 +40,7 @@ class EventListener:
         self._unsub_websocketstate = None
         self.detection_types: List[str] = detection_types
         self.ignore_cameras: List[str] = ignore_cameras
-        self.cameras: Optional[List[str]] = cameras
+        self.cameras: List[str] = cameras
 
     async def start(self):
         """Main Loop."""
@@ -63,7 +63,7 @@ class EventListener:
             return
         if msg.new_obj.camera_id in self.ignore_cameras:
             return
-        if self.cameras is not None and msg.new_obj.camera_id not in self.cameras:
+        if self.cameras and msg.new_obj.camera_id not in self.cameras:
             return
         if "end" not in msg.changed_data:
             return
diff --git a/unifi_protect_backup/missing_event_checker.py b/unifi_protect_backup/missing_event_checker.py
index e8f4876..7572ffc 100644
--- a/unifi_protect_backup/missing_event_checker.py
+++ b/unifi_protect_backup/missing_event_checker.py
@@ -3,7 +3,7 @@
 import asyncio
 import logging
 from datetime import datetime
-from typing import AsyncIterator, List, Optional
+from typing import AsyncIterator, List
 
 import aiosqlite
 from dateutil.relativedelta import relativedelta
@@ -28,8 +28,8 @@ class MissingEventChecker:
         uploader: VideoUploader,
         retention: relativedelta,
         detection_types: List[str],
-        ignore_cameras: List[str] = [],
-        cameras: Optional[List[str]] = None,
+        ignore_cameras: List[str],
+        cameras: List[str],
         interval: int = 60 * 5,
     ) -> None:
         """Init.
@@ -43,7 +43,7 @@ class MissingEventChecker:
             retention (relativedelta): Retention period to limit search window
             detection_types (List[str]): Detection types wanted to limit search
             ignore_cameras (List[str]): Ignored camera IDs to limit search
-            cameras (Optional[List[str]]): Included (ONLY) camera IDs to limit search
+            cameras (List[str]): Included (ONLY) camera IDs to limit search
             interval (int): How frequently, in seconds, to check for missing events,
         """
         self._protect: ProtectApiClient = protect
@@ -54,7 +54,7 @@ class MissingEventChecker:
         self.retention: relativedelta = retention
         self.detection_types: List[str] = detection_types
         self.ignore_cameras: List[str] = ignore_cameras
-        self.cameras: Optional[List[str]] = cameras
+        self.cameras: List[str] = cameras
         self.interval: int = interval
 
     async def _get_missing_events(self) -> AsyncIterator[Event]:
@@ -116,7 +116,7 @@ class MissingEventChecker:
                     return False  # This event is still on-going
                 if event.camera_id in self.ignore_cameras:
                     return False
-                if self.cameras is not None and event.camera_id not in self.cameras:
+                if self.cameras and event.camera_id not in self.cameras:
                     return False
                 if event.type is EventType.MOTION and "motion" not in self.detection_types:
                     return False