diff --git a/model_server/src/core/function_calling.py b/model_server/src/core/function_calling.py
index f7bb8611..194d9175 100644
--- a/model_server/src/core/function_calling.py
+++ b/model_server/src/core/function_calling.py
@@ -356,7 +356,7 @@ class ArchFunctionHandler(ArchBaseHandler):
 
         return {"result": tool_calls, "status": is_valid, "message": error_message}
 
-    def _correcting_type(value, target_type):
+    def _correcting_type(self, value, target_type):
         try:
             if target_type == float and isinstance(value, int):
                 return float(value)