diff --git a/Mage.Client/src/main/java/mage/client/MageFrame.java b/Mage.Client/src/main/java/mage/client/MageFrame.java
index 5e3bdc3201..8e0de5ec23 100644
--- a/Mage.Client/src/main/java/mage/client/MageFrame.java
+++ b/Mage.Client/src/main/java/mage/client/MageFrame.java
@@ -172,7 +172,9 @@ public class MageFrame extends javax.swing.JFrame implements MageClient {
 
         setTitle("XMage, version " + version);
         clientId = UUID.randomUUID();
-
+        // Workaround for #451
+        System.setProperty("java.util.Arrays.useLegacyMergeSort", "true");
+        
         EDTExceptionHandler.registerExceptionHandler();
         addWindowListener(new WindowAdapter() {
             @Override