diff --git a/extensions/launch-new-instance/extension.js b/extensions/launch-new-instance/extension.js
index fd970649..07830c59 100644
--- a/extensions/launch-new-instance/extension.js
+++ b/extensions/launch-new-instance/extension.js
@@ -1,6 +1,6 @@
 const AppDisplay = imports.ui.appDisplay;
 
-var _onActivateOriginal = null;
+let _activateOriginal = null;
 
 function init() {
 }