diff -r 0bfcb6585290 -r 2dcc8f2e1a1b emul/src/main/java/java/lang/AbstractStringBuilder.java
--- a/emul/src/main/java/java/lang/AbstractStringBuilder.java	Tue Dec 04 09:16:53 2012 +0100
+++ b/emul/src/main/java/java/lang/AbstractStringBuilder.java	Thu Jan 03 11:11:30 2013 +0100
@@ -1271,8 +1271,7 @@
      *            <code>null</code>.
      */
     public int indexOf(String str, int fromIndex) {
-        return String.indexOf(value, 0, count,
-                              str.toCharArray(), 0, str.length(), fromIndex);
+        return toString().indexOf(str, fromIndex);
     }
 
     /**