diff --git a/scripts/install b/scripts/install
index ec8609d..0d51853 100644
--- a/scripts/install
+++ b/scripts/install
@@ -179,7 +179,6 @@ ynh_use_logrotate --logfile "/var/log/$app"
 # Set permissions to app files
 chown root: -R $data_path
 chown -R turnserver:root /var/log/$app
-chmod 770 $data_path/Coturn_config_rotate.sh
 chmod 770 $coturn_config_path
 setfacl -R -m user:turnserver:rwX  /var/log/$app
 
diff --git a/sources/Coturn_config_rotate.sh b/sources/Coturn_config_rotate.sh
index aa980ca..774c996 100644
--- a/sources/Coturn_config_rotate.sh
+++ b/sources/Coturn_config_rotate.sh
@@ -9,14 +9,18 @@ external_IP_line="external-ip=__IPV4__,__IPV6__"
 public_ip4="$(curl ip.yunohost.org)" || true
 public_ip6="$(curl ipv6.yunohost.org)" || true
 
-if [ -n "$public_ip4" ] && ynh_validate_ip4 --ip_address="$public_ip4"
+if [[ -n "$public_ip4" ]] && ynh_validate_ip 4 "$public_ip4"
 then
-    echo "external-ip=$public_ip4" >> "$coturn_config_path"
+    external_IP_line="${external_IP_line/'__IPV4__'/$public_ip4}"
+else
+    external_IP_line="${external_IP_line/'__IPV4__,'/}"
 fi
 
-if [ -n "$public_ip6" ] && ynh_validate_ip6 --ip_address="$public_ip6"
+if [[ -n "$public_ip6" ]] && ynh_validate_ip 6 "$public_ip6"
 then
-    echo "external-ip=$public_ip6" >> "$coturn_config_path"
+    external_IP_line="${external_IP_line/'__IPV6__'/$public_ip6}"
+else
+    external_IP_line="${external_IP_line/',__IPV6__'/}"
 fi
 
 old_config_line=$(egrep "^external-ip=.*\$" "/etc/turnserver.conf")