diff -r b42bfe334128 -r eecf6077ec4e vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Mon Feb 04 09:41:33 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Feb 05 16:40:01 2013 +0100
@@ -570,7 +570,8 @@
                     emit(out, "@1 %= @2;", smapper.getI(1), smapper.popI());
                     break;
                 case opc_lrem:
-                    emit(out, "@1 %= @2;", smapper.getL(1), smapper.popL());
+                    emit(out, "@1 = @1.mod64(@2);",
+                         smapper.getL(1), smapper.popL());
                     break;
                 case opc_frem:
                     emit(out, "@1 %= @2;", smapper.getF(1), smapper.popF());