diff -r a84cb25dde74 -r b2731af0357d vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Feb 12 11:46:53 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Feb 15 16:06:12 2013 +0100
@@ -553,7 +553,7 @@
                     emit(out, "@1 *= @2;", smapper.getD(1), smapper.popD());
                     break;
                 case opc_idiv:
-                    emit(out, "@1 = Math.floor(@1 / @2);",
+                    emit(out, "@1 = @1.div32(@2);",
                          smapper.getI(1), smapper.popI());
                     break;
                 case opc_ldiv:
@@ -567,7 +567,8 @@
                     emit(out, "@1 /= @2;", smapper.getD(1), smapper.popD());
                     break;
                 case opc_irem:
-                    emit(out, "@1 %= @2;", smapper.getI(1), smapper.popI());
+                    emit(out, "@1 = @1.mod32(@2);",
+                         smapper.getI(1), smapper.popI());
                     break;
                 case opc_lrem:
                     emit(out, "@1 = @1.mod64(@2);",