diff --git a/aleph_message/models/__init__.py b/aleph_message/models/__init__.py
index 5b43e98..4fc0a50 100644
--- a/aleph_message/models/__init__.py
+++ b/aleph_message/models/__init__.py
@@ -295,7 +295,6 @@ class StoreMessage(BaseMessage):
     type: Literal[MessageType.store]
     content: StoreContent
     forgotten_by: Optional[list] = None
-    metadata: Optional[Dict[str, Any]] = None
 
 
 class ForgetMessage(BaseMessage):