diff --git a/src/yunohost/dyndns.py b/src/yunohost/dyndns.py
index 6d17cc43c..55f7fd45b 100644
--- a/src/yunohost/dyndns.py
+++ b/src/yunohost/dyndns.py
@@ -40,7 +40,7 @@ from yunohost.domain import get_public_ip
 logger = getActionLogger('yunohost.dyndns')
 
 
-re_dyndns_private_key = re.compile(
+RE_DYNDNS_PRIVATE_KEY = re.compile(
     r'.*/K(?P<domain>[^\s\+]+)\.\+157.+\.private$'
 )
 
@@ -171,7 +171,7 @@ def dyndns_update(dyn_host="dyndns.yunohost.org", domain=None, key=None,
         if domain is None:
             # Retrieve the first registered domain
             for path in glob.iglob('/etc/yunohost/dyndns/K*.private'):
-                match = re_dyndns_private_key.match(path)
+                match = RE_DYNDNS_PRIVATE_KEY.match(path)
                 if not match:
                     continue
                 _domain = match.group('domain')