Index: applications/editors/josm/plugins/undelete/src/org/openstreetmap/josm/plugins/undelete/Undelete.java
===================================================================
--- applications/editors/josm/plugins/undelete/src/org/openstreetmap/josm/plugins/undelete/Undelete.java	(revision 24905)
+++ applications/editors/josm/plugins/undelete/src/org/openstreetmap/josm/plugins/undelete/Undelete.java	(revision 26073)
@@ -119,5 +119,5 @@
         Main.pref.putInteger("undelete.lasttype", cbType.getSelectedIndex());
         Main.pref.put("undelete.newlayer", layer.isSelected());
-        Main.pref.putInteger("undelete.osmid", tfId.getOsmId());
+        Main.pref.put("undelete.osmid", Long.toString(tfId.getOsmId()));
         List<Long> ids=new ArrayList<Long>();
         ids.add((long)tfId.getOsmId());