diff --git a/lambda/mbj-newdwh2021-staging-lambda-sap-sup-receive-check-monthly.py b/lambda/mbj-newdwh2021-staging-lambda-sap-sup-receive-check-monthly.py
index 6279c87a..34cd673f 100644
--- a/lambda/mbj-newdwh2021-staging-lambda-sap-sup-receive-check-monthly.py
+++ b/lambda/mbj-newdwh2021-staging-lambda-sap-sup-receive-check-monthly.py
@@ -98,7 +98,7 @@ def lambda_handler(event, context):
         print_log(LOG_INFO, 'I-04-04', '取得したオブジェクトリストと月次I/Fファイルネーム設定ファイルの突き合わせを開始します')
         row_count = 0
         match_count = 0
-        receive_monthly_file_name_body = io.TextIOWrapper(io.BytesIO(receive_monthly_file_name_response["Body"].read()), encoding='utf-8'):
+        receive_monthly_file_name_body = io.TextIOWrapper(io.BytesIO(receive_monthly_file_name_response["Body"].read()), encoding='utf-8')
         for i, row in enumerate(csv.reader(receive_monthly_file_name_body, delimiter='\t'), 1):
             row_count = i
             file_exists = False