diff --git a/src/yunohost/dyndns.py b/src/yunohost/dyndns.py
index b4eb376dd..e1d0afd40 100644
--- a/src/yunohost/dyndns.py
+++ b/src/yunohost/dyndns.py
@@ -24,7 +24,6 @@
     Subscribe and Update DynDNS Hosts
 """
 import os
-import sys
 import requests
 import re
 import json
@@ -97,7 +96,7 @@ def dyndns_subscribe(subscribe_host="dyndns.yunohost.org", domain=None, key=None
     # Send subscription
     try:
         r = requests.post('https://%s/key/%s' % (subscribe_host, base64.b64encode(key)), data={ 'subdomain': domain })
-    except ConnectionError:
+    except requests.ConnectionError:
         raise MoulinetteError(errno.ENETUNREACH, m18n.n('no_internet_connection'))
     if r.status_code != 201:
         try:    error = json.loads(r.text)['error']
@@ -130,7 +129,7 @@ def dyndns_update(dyn_host="dynhost.yunohost.org", domain=None, key=None, ip=Non
     if ip is None:
         try:
             new_ip = requests.get('http://ip.yunohost.org').text
-        except ConnectionError:
+        except requests.ConnectionError:
             raise MoulinetteError(errno.ENETUNREACH, m18n.n('no_internet_connection'))
     else:
         new_ip = ip