diff --git a/models/res_partner.py b/models/res_partner.py
index 135d3b8f2d7bec0697a3c5dc2ecae857cfdcd683..d2576472ca1a4109ebef55cad4a74e5b2ca17016 100644
--- a/models/res_partner.py
+++ b/models/res_partner.py
@@ -690,7 +690,7 @@ class ScopPartner(models.Model):
     def _compute_last_effective(self):
         for partner in self:
             lm = partner.questionnaire_ids.search(
-                [['partner_id', '=', partner.id], ['staff_count', 'gt', 0]],
+                [['partner_id', '=', partner.id], ['staff_count', '>', 0]],
                 limit=1,
                 order='effective_date desc')
             if lm: