diff -r 14a122c18d73 -r 44ade87ef2a4 rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Jan 26 06:57:30 2016 +0100
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Jan 26 07:28:25 2016 +0100
@@ -814,7 +814,7 @@
                     smapper.replace(this, VarType.LONG, numbers.xor64(), smapper.getL(1), smapper.popL());
                     break;
                 case opc_ineg:
-                    smapper.replace(this, VarType.INTEGER, "(-(@1))", smapper.getI(0));
+                    smapper.replace(this, VarType.INTEGER, "(-(@1) | 0)", smapper.getI(0));
                     break;
                 case opc_lneg:
                     smapper.replace(this, VarType.LONG, numbers.neg64(), smapper.getL(0));