diff --git a/src/unitxt/artifact.py b/src/unitxt/artifact.py
index 144677801..dc6a025a7 100644
--- a/src/unitxt/artifact.py
+++ b/src/unitxt/artifact.py
@@ -124,7 +124,7 @@ def __init__(self, type) -> None:
 class MissingArtifactTypeError(ValueError):
     def __init__(self, dic) -> None:
         message = (
-            f"Missing 'type' parameter. Expected 'type' in artifact dict, got {dic}"
+            f"Missing '__type__' parameter. Expected 'type' in artifact dict, got {dic}"
         )
         super().__init__(message)