diff --git a/dyndns.py b/dyndns.py
index 3cc58c29a..bd2bcd486 100644
--- a/dyndns.py
+++ b/dyndns.py
@@ -146,7 +146,7 @@ def dyndns_update(dyn_host="dynhost.yunohost.org", domain=None, key=None, ip=Non
                     break
     except IOError:
         pass
-    
+
     if new_ipv6 is None:
         new_ipv6 = '0000:0000:0000:0000:0000:0000:0000:0000'
 
@@ -205,7 +205,7 @@ def dyndns_installcron():
 
     """
     with open('/etc/cron.d/yunohost-dyndns', 'w+') as f:
-        f.write('*/2 * * * * root yunohost dyndns update >> /dev/null')
+        f.write('*/2 * * * * root yunohost dyndns update >> /dev/null\n')
 
     msignals.display(m18n.n('dyndns_cron_installed'), 'success')
 
diff --git a/firewall.py b/firewall.py
index cf2f3cca7..44b05ed8f 100644
--- a/firewall.py
+++ b/firewall.py
@@ -242,7 +242,7 @@ def firewall_upnp(action=None):
         firewall['uPnP']['enabled'] = True
 
         with open('/etc/cron.d/yunohost-firewall', 'w+') as f:
-            f.write('*/50 * * * * root PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin yunohost firewall reload >>/dev/null')
+            f.write('*/50 * * * * root PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin yunohost firewall reload >>/dev/null\n')
 
         msignals.display(m18n.n('upnp_enabled'), 'success')
 
diff --git a/tools.py b/tools.py
index ed15423d6..5982e7d34 100644
--- a/tools.py
+++ b/tools.py
@@ -403,7 +403,7 @@ def tools_upgrade(ignore_apps=False, ignore_packages=False):
                 msignals.display(m18n.n('packages_upgrade_critical_later',
                                         ', '.join(critical_upgrades)))
                 with open('/etc/cron.d/yunohost-upgrade', 'w+') as f:
-                    f.write('00 * * * * root PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin apt-get install %s -y && rm -f /etc/cron.d/yunohost-upgrade' % ' '.join(critical_upgrades))
+                    f.write('00 * * * * root PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin apt-get install %s -y && rm -f /etc/cron.d/yunohost-upgrade\n' % ' '.join(critical_upgrades))
 
         if cache.get_changes():
             msignals.display(m18n.n('upgrading_packages'))