diff --git a/extensions/launch-new-instance/extension.js b/extensions/launch-new-instance/extension.js
index a9ea7c58..4a801d8a 100644
--- a/extensions/launch-new-instance/extension.js
+++ b/extensions/launch-new-instance/extension.js
@@ -16,7 +16,8 @@ function _onActivate(event) {
   Main.overview.hide();
 }
 
-function _activateResult(app) {
+function _activateResult(result) {
+  let app = this._appSys.lookup_app(result);
   app.open_new_window(-1);
 }