diff --git a/app/assets/javascripts/discourse/components/combo-box.js.es6 b/app/assets/javascripts/discourse/components/combo-box.js.es6
index e023ad267cd..4dd19bd5885 100644
--- a/app/assets/javascripts/discourse/components/combo-box.js.es6
+++ b/app/assets/javascripts/discourse/components/combo-box.js.es6
@@ -65,7 +65,11 @@ export default Ember.Component.extend({
 
     const $elem = this.$();
     const minimumResultsForSearch = this.capabilities.isIOS ? -1 : 5;
-    $elem.select2({formatResult: this.comboTemplate, minimumResultsForSearch, width: 'resolve'});
+    $elem.select2({
+      formatResult: this.comboTemplate, minimumResultsForSearch,
+      width: 'resolve',
+      allowClear: true
+    });
 
     const castInteger = this.get('castInteger');
     $elem.on("change", e => {