diff --git a/components/HotelReservation/EnterDetails/Details/schema.ts b/components/HotelReservation/EnterDetails/Details/schema.ts
index 34fc55f06..e100d2f6c 100644
--- a/components/HotelReservation/EnterDetails/Details/schema.ts
+++ b/components/HotelReservation/EnterDetails/Details/schema.ts
@@ -42,10 +42,10 @@ export const notJoinDetailsSchema = baseDetailsSchema.merge(
       }, "Only digits are allowed")
       .refine((num) => {
         if (num) {
-          return num.length === 14
+          return num.match(/^30812(?!(0|1|2))[0-9]{9}$/)
         }
         return true
-      }, "Membership number needs to be 14 digits"),
+      }, "Invalid membership number format"),
   })
 )