diff -r e4fb6c7ac42a -r aa50464da62d vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Mon Jan 14 09:17:18 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Mon Jan 14 09:47:38 2013 +0100
@@ -672,6 +672,8 @@
                          smapper.popD(), smapper.pushL());
                     break;
                 case opc_i2b:
+                    emit(out, "@1 = __toInt8(@1);", smapper.getI(0));
+                    break;
                 case opc_i2c:
                     out.append("{ /* number conversion */ }");
                     break;