diff --git a/components/tristatecheckbox/TriStateCheckbox.vue b/components/tristatecheckbox/TriStateCheckbox.vue
index 01e5705ea..2e82f32e4 100755
--- a/components/tristatecheckbox/TriStateCheckbox.vue
+++ b/components/tristatecheckbox/TriStateCheckbox.vue
@@ -73,7 +73,7 @@ export default {
                         newValue = null;
                         break;
 
-                    case null:
+                    default:
                         newValue = true;
                         break;
                 }