diff --git a/swap_guids.py b/swap_guids.py
index 1e87166..66ebba9 100644
--- a/swap_guids.py
+++ b/swap_guids.py
@@ -13,14 +13,15 @@ def modify_feed(context, feed):
         articles[article.title] = article
 
     for item in feed.items:
-        article = articles.get(item.title)
+        item_title = item['title']
+        article = articles.get(item_title)
         if not article:
-            raise Exception(f"Article not found for title: {item.title}")
+            raise Exception(f"Article not found for title: {item_title}")
 
         if not hasattr(article, 'guid') or not article.guid:
             raise Exception(f"Article '{article.title}' is missing a guid.")
 
-        item.unique_id = article.guid
+        item['unique_id'] = article.guid
 
 
 def register():