diff --git a/forge-gui/src/main/java/forge/match/MatchUtil.java b/forge-gui/src/main/java/forge/match/MatchUtil.java
index 4de424db960..a574696ef3d 100644
--- a/forge-gui/src/main/java/forge/match/MatchUtil.java
+++ b/forge-gui/src/main/java/forge/match/MatchUtil.java
@@ -71,7 +71,7 @@ import forge.view.WatchLocalGame;
 public class MatchUtil {
     private static IMatchController controller;
     private static Game game;
-    private static List<LocalGameView> gameViews = new ArrayList<LocalGameView>();
+    private static final List<LocalGameView> gameViews = new ArrayList<LocalGameView>();
 
     /** Cache of players. */
     public static final Cache<Player, PlayerView> players = new Cache<>();