diff --git a/src/promptflow-core/promptflow/executor/flow_executor.py b/src/promptflow-core/promptflow/executor/flow_executor.py
index b0fd30fd52f..1b84ca2a10a 100644
--- a/src/promptflow-core/promptflow/executor/flow_executor.py
+++ b/src/promptflow-core/promptflow/executor/flow_executor.py
@@ -477,7 +477,7 @@ def convert_flow_input_types(self, inputs: dict) -> Mapping[str, Any]:
         :return: A dictionary containing the converted inputs.
         :rtype: Mapping[str, Any]
         """
-        return FlowValidator.resolve_flow_inputs_type(self._flow.inputs, inputs)
+        return FlowValidator.resolve_flow_inputs_type(self._flow, inputs)
 
     @property
     def _default_inputs_mapping(self):