diff --git a/addons/snailmail/models/snailmail_letter.py b/addons/snailmail/models/snailmail_letter.py
index d6670f37687..843f90eb08d 100644
--- a/addons/snailmail/models/snailmail_letter.py
+++ b/addons/snailmail/models/snailmail_letter.py
@@ -333,7 +333,7 @@ class SnailmailLetter(models.Model):
         }
         """
         endpoint = self.env['ir.config_parameter'].sudo().get_param('snailmail.endpoint', DEFAULT_ENDPOINT)
-        timeout = self.env['ir.config_parameter'].sudo().get_param('snailmail.timeout', DEFAULT_TIMEOUT)
+        timeout = int(self.env['ir.config_parameter'].sudo().get_param('snailmail.timeout', DEFAULT_TIMEOUT))
         params = self._snailmail_create('print')
         response = jsonrpc(endpoint + PRINT_ENDPOINT, params=params, timeout=timeout)
         for doc in response['request']['documents']: