diff -r 04e312a7887e -r b42bfe334128 vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Feb 01 09:00:30 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Mon Feb 04 09:41:33 2013 +0100
@@ -544,7 +544,7 @@
                     emit(out, "@1 = @1.mul32(@2);", smapper.getI(1), smapper.popI());
                     break;
                 case opc_lmul:
-                    emit(out, "@1 *= @2;", smapper.getL(1), smapper.popL());
+                    emit(out, "@1 = @1.mul64(@2);", smapper.getL(1), smapper.popL());
                     break;
                 case opc_fmul:
                     emit(out, "@1 *= @2;", smapper.getF(1), smapper.popF());