diff --git a/scripts/upgrade b/scripts/upgrade
index 84dd2a9..8e505e1 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -71,7 +71,7 @@ fi
 if [ -z "$port" ]; then
 	port=$(ynh_app_setting_get --app=$app --key=http_port)
 	ynh_app_setting_set --app=$app --key=port --value=$port
-	ynh_app_setting_delete --app=app --key=http_port
+	ynh_app_setting_delete --app=$app --key=http_port
 fi
 
 # Remove old hook if exist