diff --git a/server/routes/alert.js b/server/routes/alert.js
index 144e484..1aa5ab1 100644
--- a/server/routes/alert.js
+++ b/server/routes/alert.js
@@ -11,7 +11,7 @@ const { Op } = require('sequelize');
 const alertRuleSchema = Joi.object({
   name: Joi.string().required(),
   description: Joi.string().allow('').optional(),
-  device_ids: Joi.array().items(Joi.number().integer()).optional(),
+  device_ids: Joi.array().items(Joi.string()).optional(),
   drone_types: Joi.array().items(Joi.number().integer()).optional(),
   min_rssi: Joi.number().integer().optional(),
   max_rssi: Joi.number().integer().optional(),