diff -r 04e312a7887e -r b42bfe334128 vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java	Fri Feb 01 09:00:30 2013 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java	Mon Feb 04 09:41:33 2013 +0100
@@ -94,8 +94,12 @@
         return (disX.readLong() - disY.readLong());
     }
     
-    public static long mulL(long x, long y) {
-        return (x * y);
+    public static long mulL(byte[] arrX, byte[] arrY) throws IOException {
+        ByteArrayInputStream isX = new ByteArrayInputStream(arrX);
+        DataInputStream disX = new DataInputStream(isX);
+        ByteArrayInputStream isY = new ByteArrayInputStream(arrY);
+        DataInputStream disY = new DataInputStream(isY);
+        return (disX.readLong() * disY.readLong());
     }
     
     public static long divL(long x, long y) {