1 files changed, 1 insertions, 0 deletions

diff --git a/src/mailman/model/user.py b/src/mailman/model/user.py
index 783d7f7b7..fe4f1c6d4 100644
--- a/src/mailman/model/user.py
+++ b/src/mailman/model/user.py
@@ -199,6 +199,7 @@ class User(Model):
                 store.delete(member)
         # Merge the user preferences
         self.preferences.absorb(user.preferences)
+        store.delete(user.preferences)
         # Merge display_name, password and is_server_owner attributes.
         for prop in ('display_name', 'password', 'is_server_owner'):
             if getattr(user, prop) and not getattr(self, prop):