diff --git a/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteChatCleanUpListener.class.php b/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteChatCleanUpListener.class.php
index 122c680..6788643 100644
--- a/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteChatCleanUpListener.class.php
+++ b/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteChatCleanUpListener.class.php
@@ -23,7 +23,7 @@
 /**
  * Vaporizes unneeded data.
  */
-class HourlyCleanUpCronjobExecuteChatCleanUpListener implements IParameterizedEventListener
+final class HourlyCleanUpCronjobExecuteChatCleanUpListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteTemproomListener.class.php b/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteTemproomListener.class.php
index d5f8df9..c8d67a3 100644
--- a/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteTemproomListener.class.php
+++ b/files/lib/system/event/listener/HourlyCleanUpCronjobExecuteTemproomListener.class.php
@@ -23,7 +23,7 @@
 /**
  * Removes empty temporary rooms.
  */
-class HourlyCleanUpCronjobExecuteTemproomListener implements IParameterizedEventListener
+final class HourlyCleanUpCronjobExecuteTemproomListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/InfoCommandSuspensionsListener.class.php b/files/lib/system/event/listener/InfoCommandSuspensionsListener.class.php
index 18d270d..f4ad2bd 100644
--- a/files/lib/system/event/listener/InfoCommandSuspensionsListener.class.php
+++ b/files/lib/system/event/listener/InfoCommandSuspensionsListener.class.php
@@ -23,7 +23,7 @@
 /**
  * Fetches information about the users suspensions
  */
-class InfoCommandSuspensionsListener implements IParameterizedEventListener
+final class InfoCommandSuspensionsListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/RoomActionGetUsersModeratorListener.class.php b/files/lib/system/event/listener/RoomActionGetUsersModeratorListener.class.php
index cd2a452..b8ca0fb 100644
--- a/files/lib/system/event/listener/RoomActionGetUsersModeratorListener.class.php
+++ b/files/lib/system/event/listener/RoomActionGetUsersModeratorListener.class.php
@@ -23,7 +23,7 @@
 /**
  * Adds moderator permissions to the user object.
  */
-class RoomActionGetUsersModeratorListener implements IParameterizedEventListener
+final class RoomActionGetUsersModeratorListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/RoomCanJoinBanListener.class.php b/files/lib/system/event/listener/RoomCanJoinBanListener.class.php
index 0ea920d..4f4dd6a 100644
--- a/files/lib/system/event/listener/RoomCanJoinBanListener.class.php
+++ b/files/lib/system/event/listener/RoomCanJoinBanListener.class.php
@@ -24,7 +24,7 @@
 /**
  * Denies access to banned users.
  */
-class RoomCanJoinBanListener implements IParameterizedEventListener
+final class RoomCanJoinBanListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/RoomCanJoinUserLimitListener.class.php b/files/lib/system/event/listener/RoomCanJoinUserLimitListener.class.php
index f821a59..acddcb1 100644
--- a/files/lib/system/event/listener/RoomCanJoinUserLimitListener.class.php
+++ b/files/lib/system/event/listener/RoomCanJoinUserLimitListener.class.php
@@ -24,7 +24,7 @@
 /**
  * Denies access when room is full.
  */
-class RoomCanJoinUserLimitListener implements IParameterizedEventListener
+final class RoomCanJoinUserLimitListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/RoomCanSeeTemproomListener.class.php b/files/lib/system/event/listener/RoomCanSeeTemproomListener.class.php
index 780d2c6..8af027a 100644
--- a/files/lib/system/event/listener/RoomCanSeeTemproomListener.class.php
+++ b/files/lib/system/event/listener/RoomCanSeeTemproomListener.class.php
@@ -23,7 +23,7 @@
 /**
  * Denies access to temporary rooms, unless invited.
  */
-class RoomCanSeeTemproomListener implements IParameterizedEventListener
+final class RoomCanSeeTemproomListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php b/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php
index 104ea2a..96af6d4 100644
--- a/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php
+++ b/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php
@@ -24,7 +24,7 @@
 /**
  * Denies access to muted users.
  */
-class RoomCanWritePubliclyMuteListener implements IParameterizedEventListener
+final class RoomCanWritePubliclyMuteListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/RoomEditFormTemproomListener.class.php b/files/lib/system/event/listener/RoomEditFormTemproomListener.class.php
index eb8c85a..bc93254 100644
--- a/files/lib/system/event/listener/RoomEditFormTemproomListener.class.php
+++ b/files/lib/system/event/listener/RoomEditFormTemproomListener.class.php
@@ -21,7 +21,7 @@
 /**
  * Disallow editing of temprooms in ACP.
  */
-class RoomEditFormTemproomListener implements IParameterizedEventListener
+final class RoomEditFormTemproomListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/RoomListPageTemproomListener.class.php b/files/lib/system/event/listener/RoomListPageTemproomListener.class.php
index b659e78..1e43797 100644
--- a/files/lib/system/event/listener/RoomListPageTemproomListener.class.php
+++ b/files/lib/system/event/listener/RoomListPageTemproomListener.class.php
@@ -20,7 +20,7 @@
 /**
  * Hides temprooms in ACP.
  */
-class RoomListPageTemproomListener implements IParameterizedEventListener
+final class RoomListPageTemproomListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/event/listener/SuspensionListPageTemproomListener.class.php b/files/lib/system/event/listener/SuspensionListPageTemproomListener.class.php
index 8b5d8f8..4cfa36e 100644
--- a/files/lib/system/event/listener/SuspensionListPageTemproomListener.class.php
+++ b/files/lib/system/event/listener/SuspensionListPageTemproomListener.class.php
@@ -21,7 +21,7 @@
 /**
  * Hides temprooms in ACP.
  */
-class SuspensionListPageTemproomListener implements IParameterizedEventListener
+final class SuspensionListPageTemproomListener implements IParameterizedEventListener
 {
     /**
      * @inheritDoc