diff --git a/apps/establishment/serializers/common.py b/apps/establishment/serializers/common.py
index 7b974887..691f3b43 100644
--- a/apps/establishment/serializers/common.py
+++ b/apps/establishment/serializers/common.py
@@ -315,20 +315,22 @@ class EstablishmentFavoritesCreateSerializer(serializers.ModelSerializer):
     def validate(self, attrs):
         """Override validate method"""
         # Check establishment object
-        establishment_id = self.context.get('request').parser_context.get('kwargs').get('pk')
-        establishment_qs = models.Establishment.objects.filter(id=establishment_id)
+        establishment_slug = self.context.get('request').parser_context.get('kwargs').get('slug')
+        establishment_qs = models.Establishment.objects.filter(slug=establishment_slug)
 
-        # Check establishment obj by pk from lookup_kwarg
+        # Check establishment obj by slug from lookup_kwarg
         if not establishment_qs.exists():
             raise serializers.ValidationError({'detail': _('Object not found.')})
+        else:
+            establishment = establishment_qs.first()
 
         # Check existence in favorites
         if self.get_user().favorites.by_content_type(app_label='establishment',
                                                      model='establishment')\
-                                    .by_object_id(object_id=establishment_id).exists():
+                                    .by_object_id(object_id=establishment.id).exists():
             raise utils_exceptions.FavoritesError()
 
-        attrs['establishment'] = establishment_qs.first()
+        attrs['establishment'] = establishment
         return attrs
 
     def create(self, validated_data, *args, **kwargs):