diff --git a/app/models/pin.py b/app/models/pin.py
index 9374a25..9bfdadb 100644
--- a/app/models/pin.py
+++ b/app/models/pin.py
@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, List
 from pydantic import BaseModel
 
 class Pin(BaseModel):
@@ -6,5 +6,5 @@ class Pin(BaseModel):
     title: str
     description: str
     location: list 
-    files: Optional[list]
+    files: Optional[List[str]] = []  # Liste des IDs d'images
     user_id: str
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