diff --git a/trytond/res/user.py b/trytond/res/user.py
index f73817b9f3..064076d64d 100644
--- a/trytond/res/user.py
+++ b/trytond/res/user.py
@@ -71,7 +71,7 @@ class User(ModelSQL, ModelView):
             })
 
     def default_password(self, cursor, user, context=None):
-        return ''
+        return False
 
     def default_active(self, cursor, user, context=None):
         return 1