diff --git a/backend/src/appointment/controller/mailer.py b/backend/src/appointment/controller/mailer.py
index 4076c3051..f3d7dba34 100644
--- a/backend/src/appointment/controller/mailer.py
+++ b/backend/src/appointment/controller/mailer.py
@@ -118,7 +118,6 @@ def build(self):
                     a.mime_main,
                     a.mime_sub,
                     cid=f'<{a.filename}>',
-                    filename=a.filename,
                 )
 
         return message