diff --git a/pkgs/kat/theme-editor/app.js b/pkgs/kat/theme-editor/app.js
index 07f03d4..e95b093 100644
--- a/pkgs/kat/theme-editor/app.js
+++ b/pkgs/kat/theme-editor/app.js
@@ -376,7 +376,7 @@ export default {
           let result = await Root.Modal.prompt(
             "Warning",
             "You have unsaved changes, are you sure you want to exit?",
-            NpWindow.window
+            MyWindow.window
           );
           if (result !== true) {
             return false;