diff --git a/apps/web/config/schema/env.js b/apps/web/config/schema/env.js
index 2966a3b..9c1bd8a 100644
--- a/apps/web/config/schema/env.js
+++ b/apps/web/config/schema/env.js
@@ -2,7 +2,7 @@ const { z } = require('zod');
 
 const envSchema = z.object({
   URL_IUS_DIRECT: z.string(),
-  USE_DEV_COLORS: z.string(),
+  USE_DEV_COLORS: z.string().optional(),
 });
 
 module.exports = envSchema;