diff -r 3bb0eb51bed6 -r c6a0b5b64133 emul/src/main/java/java/lang/AbstractStringBuilder.java
--- a/emul/src/main/java/java/lang/AbstractStringBuilder.java	Wed Nov 21 21:48:51 2012 +0100
+++ b/emul/src/main/java/java/lang/AbstractStringBuilder.java	Sun Nov 25 23:14:58 2012 +0100
@@ -602,7 +602,7 @@
      */
     @JavaScriptBody(
         args={ "self", "i" },
-        body="return java_lang_AbstractStringBuilder_appendLjava_lang_AbstractStringBuilderLjava_lang_String(self,i.toString());"
+        body="return java_lang_AbstractStringBuilder_proto().appendLjava_lang_AbstractStringBuilderLjava_lang_String(self,i.toString());"
     )
     public AbstractStringBuilder append(int i) {
         if (i == Integer.MIN_VALUE) {