diff --git a/addons/hr_payroll/hr_payroll.py b/addons/hr_payroll/hr_payroll.py
index a8bafe43685..ba997f5adec 100644
--- a/addons/hr_payroll/hr_payroll.py
+++ b/addons/hr_payroll/hr_payroll.py
@@ -318,7 +318,9 @@ class hr_payslip(osv.osv):
             'company_id': company_id,
             'period_id': False,
             'basic_before_leaves': 0.0,
-            'basic_amount': 0.0
+            'basic_amount': 0.0,
+            'number': '',
+            'payslip_run_id': False,
         })
         return super(hr_payslip, self).copy(cr, uid, id, default, context=context)