diff --git a/config_panel.toml b/config_panel.toml
index 71a9384..b03b3bd 100644
--- a/config_panel.toml
+++ b/config_panel.toml
@@ -103,6 +103,7 @@ name = "Configuration"
         [main.hotspot.dns]
         ask = "DNS resolvers"
         type = "tags"
+        optional = true
         visible = "advanced"
         pattern.regexp = '^([0-9.]{7,15}|[0-9a-fA-F:]+)$'
         pattern.error = "Not an ip"
diff --git a/manifest.json b/manifest.json
index 369f0f2..0c165f2 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "Create and manager wifi networks, share Internet access and use YunoHost apps accross wifi",
         "fr": "Créer et configurer des réseaux wifi, partager l'accès a Internet et utiliser les applications YunoHost via wifi"
     },
-    "version": "2.2.0~ynh1",
+    "version": "2.2.1~ynh1",
     "url": "https://github.com/labriqueinternet/hotspot_ynh",
     "license": "AGPL-3.0",
     "maintainer": {
diff --git a/scripts/config b/scripts/config
index ad92a84..a0a5fc8 100644
--- a/scripts/config
+++ b/scripts/config
@@ -199,7 +199,7 @@ ynh_app_config_apply() {
 
     # Stop vpn client
     ynh_print_info --message="Stopping hotspot in order to edit files"
-    systemctl stop ${service_name}
+    yunohost service stop $service_name
 
     _ynh_app_config_apply
 
@@ -209,7 +209,7 @@ ynh_app_config_apply() {
 
         # Start hotspot
         ynh_print_info --message="Starting hotspot service if needed"
-        systemctl start ${service_name}
+        yunohost service start $service_name
     else
         ynh_print_info --message="Cleanup hotspot config files"
         ynh_secure_remove --file="/etc/hostapd/$app/hostapd.conf"