diff --git a/src/yunohost/app.py b/src/yunohost/app.py
index 2326995a..c8e9ff48 100644
--- a/src/yunohost/app.py
+++ b/src/yunohost/app.py
@@ -1037,11 +1037,11 @@ def app_ssowatconf(auth):
         # Check ACME challenge file is present in nginx conf
         nginx_acme_challenge_conf_file = "/etc/nginx/conf.d/"+domain+".d/000-acmechallenge.conf"
         if not (os.path.isfile(nginx_acme_challenge_conf_file)) : continue
-        
+
         # Check the file contains the ACME challenge uri
         acme_uri = '/.well-known/acme-challenge'
         if not (acme_uri in open(nginx_acme_challenge_conf_file).read()) : continue
-        
+
         # If so, then authorize the ACME challenge uri to unprotected regex
         regex = domain+"/%.well%-known/acme%-challenge/.*$"
         unprotected_regex.append(regex)