diff -r cc0e6767259b -r 4252bfc396fc vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Feb 19 15:59:27 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Feb 26 14:55:55 2013 +0100
@@ -691,7 +691,7 @@
                     emit(out, "var @2 = @1;", smapper.popD(), smapper.pushF());
                     break;
                 case opc_f2i:
-                    emit(out, "var @2 = Math.floor(@1);",
+                    emit(out, "var @2 = Math.floor(@1).toInt32();",
                          smapper.popF(), smapper.pushI());
                     break;
                 case opc_f2l:
@@ -699,7 +699,7 @@
                          smapper.popF(), smapper.pushL());
                     break;
                 case opc_d2i:
-                    emit(out, "var @2 = Math.floor(@1);",
+                    emit(out, "var @2 = Math.floor(@1).toInt32();",
                          smapper.popD(), smapper.pushI());
                     break;
                 case opc_d2l: