diff -r 4c2b92281cdc -r e606853325f1 vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Thu Jan 31 20:19:38 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Thu Jan 31 20:37:12 2013 +0100
@@ -594,7 +594,7 @@
                     emit(out, "@1 ^= @2;", smapper.getI(1), smapper.popI());
                     break;
                 case opc_lxor:
-                    emit(out, "@1 ^= @2;", smapper.getL(1), smapper.popL());
+                    emit(out, "@1 = @1.xor64(@2)", smapper.getL(1), smapper.popL());
                     break;
                 case opc_ineg:
                     emit(out, "@1 = -@1;", smapper.getI(0));