diff --git a/notus/scanner/messages/result.py b/notus/scanner/messages/result.py
index 30221ae..53dda89 100644
--- a/notus/scanner/messages/result.py
+++ b/notus/scanner/messages/result.py
@@ -28,7 +28,7 @@ def __init__(
         oid: str,
         value: str,
         port: str = "package",
-        uri: str = None,
+        uri: str = "",
         result_type: ResultType = ResultType.ALARM,
         message_id: Optional[UUID] = None,
         group_id: Optional[UUID] = None,