--- a/langtools/src/share/classes/com/sun/tools/javac/processing/JavacProcessingEnvironment.java	Mon Dec 10 12:10:50 2012 +0000
+++ b/langtools/src/share/classes/com/sun/tools/javac/processing/JavacProcessingEnvironment.java	Mon Dec 10 16:21:26 2012 +0000
@@ -1336,7 +1336,7 @@
         return nodes;
     }
 
-    private static TreeScanner treeCleaner = new TreeScanner() {
+    private static final TreeScanner treeCleaner = new TreeScanner() {
             public void scan(JCTree node) {
                 super.scan(node);
                 if (node != null)