diff --git a/src/main/java/com/ffii/tsms/modules/data/web/models/NewStaffRequest.kt b/src/main/java/com/ffii/tsms/modules/data/web/models/NewStaffRequest.kt
index 39a8feb..b536172 100644
--- a/src/main/java/com/ffii/tsms/modules/data/web/models/NewStaffRequest.kt
+++ b/src/main/java/com/ffii/tsms/modules/data/web/models/NewStaffRequest.kt
@@ -21,7 +21,7 @@ data class NewStaffRequest(
     val email: String,
     @field:NotBlank(message = "Staff employType cannot be empty")
     val employType: String,
-    @field:NotBlank(message = "Staff grade cannot be empty")
+    @field:NotNull(message = "Staff grade cannot be empty")
     val gradeId: Long,
 
     val joinDate: LocalDate?,