diff --git a/inference_schema/schema_decorators.py b/inference_schema/schema_decorators.py
index 940b332..cf42dfb 100644
--- a/inference_schema/schema_decorators.py
+++ b/inference_schema/schema_decorators.py
@@ -44,8 +44,9 @@ def input_schema(param_name, param_type, convert_to_provided_type=True, optional
     @_schema_decorator(attr_name=INPUT_SCHEMA_ATTR, schema=swagger_schema, supported_versions=supported_versions)
     def decorator_input(user_run, instance, args, kwargs):
         args_keys = args[0].keys()
+        is_hftransformersv2 = len(args_keys) == 2 and "parameters" in args_keys and "input_string" in args_keys
         # skip all of this for hftransformersv2
-        if convert_to_provided_type and not (len(args_keys) == 2 and "parameters" in args_keys and "input_string" in args_keys):
+        if convert_to_provided_type and not is_hftransformersv2:
             args = list(args)
             if param_name not in kwargs.keys() and not optional:
                 decorators = _get_decorators(user_run)