diff -r 8a25056ef283 -r 7ffb635a5c4f emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js
--- a/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Tue Feb 05 17:12:17 2013 +0100
+++ b/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Wed Feb 06 12:46:35 2013 +0100
@@ -188,10 +188,10 @@
 };
 
 Number.prototype.compare64 = function(x) {
-    if (this.hi == x.hi) {
-        return (this == x) ? 0 : ((this < x) ? -1 : 1);
+    if (this.high32() === x.high32()) {
+        return (this < x) ? -1 : ((this > x) ? 1 : 0);
     }
-    return (this.hi < x.hi) ? -1 : 1;
+    return (this.high32() < x.high32()) ? -1 : 1;
 };
 
 Number.prototype.neg64 = function() {