diff --git a/app/assets/javascripts/discourse/components/auto-close-form.js.es6 b/app/assets/javascripts/discourse/components/auto-close-form.js.es6
index 51669101067..2d564d246d4 100644
--- a/app/assets/javascripts/discourse/components/auto-close-form.js.es6
+++ b/app/assets/javascripts/discourse/components/auto-close-form.js.es6
@@ -18,7 +18,10 @@ export default Ember.Component.extend({
   },
 
   @observes("autoCloseTime", "limited")
-  _updateAutoCloseValid(autoCloseTime, limited) {
+  _updateAutoCloseValid() {
+    const autoCloseTime = this.get("autoCloseTime");
+    const limited = this.get("limited");
+
     var isValid = this._isAutoCloseValid(autoCloseTime, limited);
     this.set("autoCloseValid", isValid);
   },