diff --git a/lambda/sap-sup-receive-check-monthly/sap-sup-receive-check-monthly.py b/lambda/sap-sup-receive-check-monthly/sap-sup-receive-check-monthly.py
index 5c95d37f..07f391d6 100644
--- a/lambda/sap-sup-receive-check-monthly/sap-sup-receive-check-monthly.py
+++ b/lambda/sap-sup-receive-check-monthly/sap-sup-receive-check-monthly.py
@@ -173,7 +173,7 @@ def lambda_handler(event, context):
                 raise FileReadException('E-05-02', e)
 
             logger.info(f'I-05-07 メール送信指示をします　送信先トピック：{MBJ_SAP_NOTICE_TOPIC}')
-            mail_title_without_line_break = mail_title()[0]
+            mail_title_without_line_break = mail_title.splitlines()[0]
             params = {
                 'TopicArn': MBJ_SAP_NOTICE_TOPIC,
                 'Subject': mail_title_without_line_break,