diff --git a/src/python3_anticaptcha/core/sio_captcha_handler.py b/src/python3_anticaptcha/core/sio_captcha_handler.py
index 3526972..24388c0 100644
--- a/src/python3_anticaptcha/core/sio_captcha_handler.py
+++ b/src/python3_anticaptcha/core/sio_captcha_handler.py
@@ -62,7 +62,7 @@ class SIOCaptchaHandler(CaptchaHandler):
         # if a local file link is passed
         if captcha_file:
             self.captcha_params.create_task_payload.task.update(
-                {"body": base64.b64encode(self._local_file_captcha(captcha_file)).decode("utf-8")}
+                {"body": base64.b64encode(self._local_file_captcha(captcha_file=captcha_file)).decode("utf-8")}
             )
         # if the file is transferred in base64 encoding
         elif captcha_base64: