diff --git a/trytond/ir/lang.py b/trytond/ir/lang.py
index a656938292..bf2acf5c8e 100644
--- a/trytond/ir/lang.py
+++ b/trytond/ir/lang.py
@@ -59,7 +59,7 @@ class Lang(ModelSQL, ModelView, Cacheable):
         if ids:
             ids += self.search([('name',) + clause[1:]], order=[])
             return [('id', 'in', ids)]
-        return [('name',) + clause[1:]]
+        return [('name',) + tuple(clause[1:])]
 
     def read(self, ids, fields_names=None):
         pool = Pool()
diff --git a/trytond/res/user.py b/trytond/res/user.py
index 07caaab604..18d2ee00b4 100644
--- a/trytond/res/user.py
+++ b/trytond/res/user.py
@@ -266,7 +266,7 @@ class User(ModelSQL, ModelView):
             ], order=[])
         if len(ids) == 1:
             return [('id', '=', ids[0])]
-        return [(self._rec_name,) + clause[1:]]
+        return [(self._rec_name,) + tuple(clause[1:])]
 
     def copy(self, ids, default=None):
         if default is None: