diff --git a/Server/src/main/java/uulm/teamname/marvelous/server/LobbyManager/MessageRelay.java b/Server/src/main/java/uulm/teamname/marvelous/server/LobbyManager/MessageRelay.java
index 06af9d7..9f73b41 100644
--- a/Server/src/main/java/uulm/teamname/marvelous/server/LobbyManager/MessageRelay.java
+++ b/Server/src/main/java/uulm/teamname/marvelous/server/LobbyManager/MessageRelay.java
@@ -6,8 +6,8 @@ import uulm.teamname.marvelous.server.Lobby.Lobby;
 import java.util.HashMap;
 
 public class MessageRelay {
-    private HashMap<WebSocket, Lobby> lobbies;
-    private HashMap<Lobby, WebSocket> sockets;
+    private final HashMap<WebSocket, Lobby> lobbies;
+    private final HashMap<Lobby, WebSocket> sockets;
 
     public MessageRelay() {
         this.lobbies = new HashMap<>();