Index: /trunk/src/org/openstreetmap/josm/actions/JoinAreasAction.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/actions/JoinAreasAction.java	(revision 9292)
+++ /trunk/src/org/openstreetmap/josm/actions/JoinAreasAction.java	(revision 9293)
@@ -1510,5 +1510,7 @@
     private void stripTags(Collection<Way> ways) {
         for (Way w : ways) {
+            final Way wayWithoutTags = new Way(w);
             w.removeAll();
+            cmds.add(new ChangeCommand(w, wayWithoutTags));
         }
         /* I18N: current action printed in status display */