diff --git a/apps/transfer/serializers/partner.py b/apps/transfer/serializers/partner.py
index 7d2f80a6..f419ff1a 100644
--- a/apps/transfer/serializers/partner.py
+++ b/apps/transfer/serializers/partner.py
@@ -58,7 +58,7 @@ class PartnerSerializer(serializers.Serializer):
         obj.old_id = old_id
         obj.created = created
 
-        obj.establishment.add([establishment])
+        obj.establishment.add(establishment)
         if is_created:
             obj.images = [image]
         else: