diff --git a/src/modules/09_leave/components/3_WorkTime/DialogForm.vue b/src/modules/09_leave/components/3_WorkTime/DialogForm.vue
index 0ba9095d2..11ba81bfc 100644
--- a/src/modules/09_leave/components/3_WorkTime/DialogForm.vue
+++ b/src/modules/09_leave/components/3_WorkTime/DialogForm.vue
@@ -378,7 +378,11 @@ watch(
             <div class="row items-center q-my-sm justify-between">
               <p class="q-ma-none">สถานะการใช้งาน</p>
               <label class="toggle-control">
-                <input type="checkbox" v-model="formData.isActive" />
+                <input
+                  type="checkbox"
+                  v-model="formData.isActive"
+                  :disabled="formData.isDefault"
+                />
                 <span class="control"></span>
               </label>
             </div>