diff --git a/bin/osv/orm.py b/bin/osv/orm.py
index 496d569a29c..ef2ca8e171a 100644
--- a/bin/osv/orm.py
+++ b/bin/osv/orm.py
@@ -4096,7 +4096,7 @@ class orm(orm_template):
                 else:
                     default['state'] = self._defaults['state']
 
-        context_wo_lang = context
+        context_wo_lang = context.copy()
         if 'lang' in context:
             del context_wo_lang['lang']
         data = self.read(cr, uid, [id], context=context_wo_lang)[0]