diff --git a/data/hooks/conf_regen/43-dnsmasq b/data/hooks/conf_regen/43-dnsmasq
index 897adf19b..31c75d778 100644
--- a/data/hooks/conf_regen/43-dnsmasq
+++ b/data/hooks/conf_regen/43-dnsmasq
@@ -3,6 +3,8 @@ set -e
 
 force=$1
 
+. /usr/share/yunohost/apps/helpers
+
 function safe_copy () {
     if [[ "$force" == "True" ]]; then
         sudo yunohost service safecopy \
@@ -16,10 +18,12 @@ function safe_copy () {
 cd /usr/share/yunohost/templates/dnsmasq
 
 # Get IPv4 address
-ip=$(curl -s -4 https://ip.yunohost.org 2>/dev/null || echo '0.0.0.0')
+ip=$(curl -s -4 https://ip.yunohost.org 2>/dev/null)
+ynh_validate_ip4 $ip || ip='0.0.0.0'
 
 # Get IPv6 IP address
-ipv6=$(curl -s -6 http://ip6.yunohost.org 2>/dev/null || echo '')
+ipv6=$(curl -s -6 http://ip6.yunohost.org 2>/dev/null)
+ynh_validate_ip6 $ipv6 || ipv6=''
 
 sudo mkdir -p /etc/dnsmasq.d