diff --git a/addons/email_template/email_template.py b/addons/email_template/email_template.py
index ed35349f420..f09fb41b8c4 100644
--- a/addons/email_template/email_template.py
+++ b/addons/email_template/email_template.py
@@ -378,7 +378,7 @@ class email_template(osv.osv):
                     # Ensure report is rendered using template's language
                     ctx = context.copy()
                     if template.lang:
-                        ctx['lang'] = self.render_template_batch(cr, uid, template.lang, template.model, res_id, context)  # take 0 ?
+                        ctx['lang'] = self.render_template_batch(cr, uid, template.lang, template.model, [res_id], context)  # take 0 ?
                     result, format = openerp.report.render_report(cr, uid, [res_id], report_service, {'model': template.model}, ctx)
                     result = base64.b64encode(result)
                     if not report_name: