diff --git a/reaction-mailcreate/createMails.py b/reaction-mailcreate/createMails.py
index 85573f9ccf8fa6b3fd0def9909f7afc3e1e189f6..1833f31e4cfc74a7ea50471f306a3e0c3022b1a8 100755
--- a/reaction-mailcreate/createMails.py
+++ b/reaction-mailcreate/createMails.py
@@ -64,7 +64,7 @@ parser.add_argument(      '--smtpuser',   dest='smtpuser',   default=None, help=
 parser.add_argument(      '--smtppass',   dest='smtppass',   default=None, help='SMTP password to login with (default: none); implies TLS (port 465) unless STARTTLS is set as well; will be queried interactively if set to "-"')
 parser.add_argument(      '--starttls',   dest='starttls',   default=False, action='store_true', help='login using STARTTLS (default: False); implies port 587')
 parser.add_argument('-t', '--template',   dest='template',   default='{basedir}/{campaign}/Mail.template', help='mail template file (default: "{basedir}/{campaign}/Mail.template")')
-parser.add_argument(      '--timestamp',  dest='timestamp',  default='%Y-%m-%dT%H:%M:%SZ', help='timestamp format used for {timestamp} keyword (default: "%Y-%m-%dT%H:%M:%SZ")')
+parser.add_argument(      '--timestamp',  dest='timestamp',  default='%Y-%m-%dT%H:%M:%SZ', help='timestamp format used for {timestamp} keyword (default: "%%Y-%%m-%%dT%%H:%%M:%%SZ")')
 parser.add_argument('-T', '--to',         dest='to',         default='{firstname} {lastname} <{email}>', help='recipient mail address (default: "{firstname} {lastname} <{email}>")')
 parser.add_argument('-u', '--url',        dest='url',        default='{webserver}/{campaign}{infix}-{hash}', help='URL template to use (default: "{webserver}/{campaign}{infix}-{hash}"')
 parser.add_argument('-U', '--createurl',  dest='createurl',  default='{webserver}/{campaign}{infix}-{hash}/create', help='URL template to use for creation URL (default: "{webserver}/{campaign}{infix}-{hash}/create"')