diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 9d884cef5..55c680877 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -648,8 +648,9 @@ class WindowCyclerPopup extends CyclerPopup {
     }
 });
 
-var AppIcon = GObject.registerClass(
-class AppIcon extends St.BoxLayout {
+var AppIcon = GObject.registerClass({
+    GTypeName: 'AltTab_AppIcon'
+}, class AppIcon extends St.BoxLayout {
     _init(app) {
         super._init({ style_class: 'alt-tab-app',
                       vertical: true });