diff --git a/ote_sdk/ote_sdk/utils/argument_checks.py b/ote_sdk/ote_sdk/utils/argument_checks.py
index 1733cbc6a02..1d383a9e373 100644
--- a/ote_sdk/ote_sdk/utils/argument_checks.py
+++ b/ote_sdk/ote_sdk/utils/argument_checks.py
@@ -481,7 +481,7 @@ def __init__(self, parameter, parameter_name):
         super().__init__(
             parameter=parameter,
             parameter_name=parameter_name,
-            expected_file_extension=["json"],
+            expected_file_extension=[".json"],
         )