diff -r 8db5cf267d74 -r 15df78d24302 vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Oct 30 22:22:18 2012 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Oct 30 22:35:32 2012 +0100
@@ -967,9 +967,10 @@
     }
     
     private void addReference(String cn) throws IOException {
-        out.append(" /* needs ").append(cn).append(" */");
         if (references != null) {
-            references.add(cn);
+            if (references.add(cn)) {
+                out.append(" /* needs ").append(cn).append(" */");
+            }
         }
     }