diff --git a/wizard/scop_membership_out_wizard.py b/wizard/scop_membership_out_wizard.py
index eeb1ceb1c65ef12b11ad76f64b78b58b3ee7415d..58d359afa82cc45163ec09aa24806a274433a4cc 100644
--- a/wizard/scop_membership_out_wizard.py
+++ b/wizard/scop_membership_out_wizard.py
@@ -48,7 +48,7 @@ class ScopMembershipOutWizard(models.TransientModel):
                 for lp in last_periods:
                     period_type_id = lp.type_id.id
                     period.member_out_period(
-                        period.partner_id,
+                        period.partner_id.id,
                         period_type_id,
                         period.end,
                         period.end_reason_id.id,