diff --git a/src/main/java/com/example/tictactoe_game/TicTacToeFX.java b/src/main/java/com/example/tictactoe_game/TicTacToeFX.java
index a4e23a8e468dff545e07976060daf9f89a554dee..031f95a0dd6686fc17558fdcd3a32a3e766548f3 100644
--- a/src/main/java/com/example/tictactoe_game/TicTacToeFX.java
+++ b/src/main/java/com/example/tictactoe_game/TicTacToeFX.java
@@ -8,7 +8,7 @@ import javafx.stage.Stage;
 
 public class TicTacToeFX extends Application {
 
-    private Button[][] buttons = new Button[3][3];
+    private final Button[][] buttons = new Button[3][3];
 
     private boolean isXTurn = true;