Index: trunk/trac/attachment.py
===================================================================
--- trunk/trac/attachment.py	(revision 2869)
+++ trunk/trac/attachment.py	(working copy)
@@ -151,6 +151,11 @@
                            (self.parent_type, self.parent_id, filename,
                             self.size, self.time, self.description, self.author,
                             self.ipnr))
+            if self.parent_type == 'ticket':
+                cursor.execute("UPDATE ticket "
+                               "SET changetime = %s "
+                               "WHERE id = %s",
+                               (self.time, self.parent_id))
             shutil.copyfileobj(fileobj, targetfile)
             self.filename = filename