diff --git a/openerp/addons/base/res/res_users.py b/openerp/addons/base/res/res_users.py
index a181e141eb4..58e0d216a07 100644
--- a/openerp/addons/base/res/res_users.py
+++ b/openerp/addons/base/res/res_users.py
@@ -511,6 +511,7 @@ class res_users(osv.osv):
         if not passwd:
             # empty passwords disallowed for obvious security reasons
             raise openerp.exceptions.AccessDenied()
+        db = self.pool.db_name
         if self.__uid_cache.setdefault(db, {}).get(uid) == passwd:
             return
         cr = self.pool.cursor()