diff --git a/sources/Coturn_config_rotate.sh b/sources/Coturn_config_rotate.sh
index 774c996..7f41aa4 100644
--- a/sources/Coturn_config_rotate.sh
+++ b/sources/Coturn_config_rotate.sh
@@ -9,7 +9,7 @@ external_IP_line="external-ip=__IPV4__,__IPV6__"
 public_ip4="$(curl ip.yunohost.org)" || true
 public_ip6="$(curl ipv6.yunohost.org)" || true
 
-if [[ -n "$public_ip4" ]] && ynh_validate_ip 4 "$public_ip4"
+if [ -n "$public_ip4" ] && ynh_validate_ip4 --ip_address="$public_ip4"
 then
     external_IP_line="${external_IP_line/'__IPV4__'/$public_ip4}"
 else