Index: /trunk/src/org/openstreetmap/josm/io/AbstractReader.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/io/AbstractReader.java	(revision 5122)
+++ /trunk/src/org/openstreetmap/josm/io/AbstractReader.java	(revision 5123)
@@ -32,5 +32,5 @@
      * The dataset to add parsed objects to.
      */
-    protected final DataSet ds = new DataSet();
+    protected DataSet ds = new DataSet();
 
     protected Changeset uploadChangeset;