diff --git a/files/lib/system/page/handler/LogPageHandler.class.php b/files/lib/system/page/handler/LogPageHandler.class.php
index ab63e73..e12e274 100644
--- a/files/lib/system/page/handler/LogPageHandler.class.php
+++ b/files/lib/system/page/handler/LogPageHandler.class.php
@@ -27,7 +27,7 @@
 /**
  * Allows to choose a room in the menu item management.
  */
-class LogPageHandler extends AbstractLookupPageHandler implements IOnlineLocationPageHandler
+final class LogPageHandler extends AbstractLookupPageHandler implements IOnlineLocationPageHandler
 {
     use TRoomPageHandler;
     use TOnlineLocationPageHandler;
diff --git a/files/lib/system/page/handler/RoomListPageHandler.class.php b/files/lib/system/page/handler/RoomListPageHandler.class.php
index 2501fcf..16fb161 100644
--- a/files/lib/system/page/handler/RoomListPageHandler.class.php
+++ b/files/lib/system/page/handler/RoomListPageHandler.class.php
@@ -22,7 +22,7 @@
 /**
  * Shows the number of chatters in the RoomList menu item.
  */
-class RoomListPageHandler extends AbstractMenuPageHandler
+final class RoomListPageHandler extends AbstractMenuPageHandler
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/page/handler/RoomPageHandler.class.php b/files/lib/system/page/handler/RoomPageHandler.class.php
index 8e3e52e..b1055ae 100644
--- a/files/lib/system/page/handler/RoomPageHandler.class.php
+++ b/files/lib/system/page/handler/RoomPageHandler.class.php
@@ -26,7 +26,7 @@
 /**
  * Allows to choose a room in the menu item management.
  */
-class RoomPageHandler extends AbstractLookupPageHandler implements IOnlineLocationPageHandler
+final class RoomPageHandler extends AbstractLookupPageHandler implements IOnlineLocationPageHandler
 {
     use TRoomPageHandler;
     use TOnlineLocationPageHandler;