diff --git a/addons/account/wizard/account_report_common.py b/addons/account/wizard/account_report_common.py
index 52a35327845..229ef3e4167 100644
--- a/addons/account/wizard/account_report_common.py
+++ b/addons/account/wizard/account_report_common.py
@@ -175,7 +175,7 @@ class account_common_report(osv.osv_memory):
                 data['form'][field] = data['form'][field][0]
         used_context = self._build_contexts(cr, uid, ids, data, context=context)
         data['form']['periods'] = used_context.get('periods', False) and used_context['periods'] or []
-        data['form']['used_context'] = used_context
+        data['form']['used_context'] = dict(used_context, lang=context.get('lang', 'en_US'))
         return self._print_report(cr, uid, ids, data, context=context)
 
 account_common_report()