diff --git a/org/homelinux/largo/checkers/Checkers.java b/org/homelinux/largo/checkers/Checkers.java
--- a/org/homelinux/largo/checkers/Checkers.java
+++ b/org/homelinux/largo/checkers/Checkers.java
@@ -22,7 +22,7 @@
 import org.homelinux.largo.utils.BrowserLaunch;
 
 public class Checkers extends JFrame implements Runnable {
-    static final long serialVersionUID = 250408;
+    static final long serialVersionUID = 1L;
     static final String helpURL = "http://largo.homelinux.org/cgi-bin/gitweb.cgi?p=games/Schach.git;a=summary";
 
     MouseListener listener;