=== modified file 'src/mailman/model/usermanager.py'
--- src/mailman/model/usermanager.py	2015-02-06 03:04:45 +0000
+++ src/mailman/model/usermanager.py	2015-03-19 05:26:56 +0000
@@ -49,6 +49,7 @@
     @dbconnection
     def delete_user(self, store, user):
         """See `IUserManager`."""
+        store.delete(user.preferences)
         store.delete(user)
 
     @dbconnection

=== modified file 'src/mailman/rest/users.py'
--- src/mailman/rest/users.py	2015-02-10 00:41:46 +0000
+++ src/mailman/rest/users.py	2015-03-19 05:29:11 +0000
@@ -185,7 +185,7 @@
         return UserAddresses(self._user)
 
     def on_delete(self, request, response):
-        """Delete the named user, all her memberships, and addresses."""
+        """Delete the named user, all her memberships, addresses and preferences."""
         if self._user is None:
             not_found(response)
             return