diff --git a/scripts/_common.sh b/scripts/_common.sh
index d202174..fd88197 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -46,6 +46,8 @@ configure_network_interface_dnsmasq(){
     systemctl restart dnsmasq
 
     ynh_store_file_checksum --file="/etc/dnsmasq.d/$app"
+
+    ynh_port_available --port=53 || ynh_die --message="Port 53 is needs to be available for this app"
 }
 
 is_public_ip(){