diff --git a/scripts/install b/scripts/install
index 559126c..e5bc27f 100644
--- a/scripts/install
+++ b/scripts/install
@@ -76,7 +76,7 @@ if [ $discovery -eq 1 ]; then
 	ynh_script_progression --message="Configuring firewall..." --time --weight=1
 
 	# Open port 1900 for service auto-discovery
-	if [[ $(ynh_port_available --port=1900) -eq 0 ]]; then
+	if ynh_port_available --port=1900; then
 		ynh_exec_warn_less yunohost firewall allow UDP 1900
 		ynh_app_setting_set --app=$app --key=discovery_service --value=1
 	else