diff --git a/app/models/bundle.py b/app/models/bundle.py
index 7b15a9f..475d710 100644
--- a/app/models/bundle.py
+++ b/app/models/bundle.py
@@ -48,4 +48,4 @@ class Bundle(BaseModel):
         return total
 
     def ordered_items(self) -> List[Item]:
-        return sorted(self.items, key=lambda x: x.position)
+        return sorted(self.items, key=lambda item: item.position)