diff --git a/static/mysc_objects.js b/static/mysc_objects.js
index e322a8a..00587c1 100644
--- a/static/mysc_objects.js
+++ b/static/mysc_objects.js
@@ -262,12 +262,9 @@ function SCase(uuid, name, data) {
   this.reset = function () {
     this.cats.each(function (idx, cat) {
       for (idx in cat.things) {
-        if (cat.things[idx].checked) {
-          cat.things[idx].checked = false;
-        }
+        cat.things[idx].reset();
       }
     });
-    this.lastChange = new Date().getTime();
     return true;
   };
 
@@ -586,6 +583,11 @@ function Thing(uuid, label, nb, checked) {
     this.removed = data.removed || false;
   };
 
+  this.reset = function () {
+    this.checked = false;
+    this.lastChange = new Date().getTime();
+  };
+
   this.export = function () {
     return {
       uuid: this.uuid,