diff --git a/models/res_partner.py b/models/res_partner.py
index 884264f3c419878234658b38862213f5df95c965..97fffdbfed50a955b41a5ac3695229a7d871bfb5 100644
--- a/models/res_partner.py
+++ b/models/res_partner.py
@@ -355,7 +355,7 @@ class ScopPartner(models.Model):
         """
         # Check Staff
         staff_line = self.get_last_membership_staff()
-        if not (staff_line or staff_line.staff_count > 0):
+        if not staff_line or staff_line.staff_count < 1:
             raise UserError(_("Les effectifs à l'adhésion ne sont pas renseignés."))
         # Check financial datas
         if not self.liasse_membership_id: