diff --git a/addons/hr_holidays/hr_holidays.py b/addons/hr_holidays/hr_holidays.py
index 864a3200bdf..77cd53551b8 100644
--- a/addons/hr_holidays/hr_holidays.py
+++ b/addons/hr_holidays/hr_holidays.py
@@ -375,7 +375,7 @@ class hr_employee(osv.osv):
                 h.state='validate' and
                 s.limit=False and
                 h.employee_id in (%s)
-            group by h.employee_id""", (','.join(map(str,ids)),) )
+            group by h.employee_id"""% (','.join(map(str,ids)),) )
         res = cr.dictfetchall()
         remaining = {}
         for r in res: