diff --git a/js/misc/introspect.js b/js/misc/introspect.js
index f7a7f2fe6..3ff48b016 100644
--- a/js/misc/introspect.js
+++ b/js/misc/introspect.js
@@ -42,8 +42,6 @@ var IntrospectService = class {
     }
 
     _isStandaloneApp(app) {
-        let windows = app.get_windows();
-
         return app.get_windows().some(w => w.transient_for == null);
     }