diff --git a/lib/browser/guest-window-manager.js b/lib/browser/guest-window-manager.js
index 4c4dc90d0741..0e4ae309282f 100644
--- a/lib/browser/guest-window-manager.js
+++ b/lib/browser/guest-window-manager.js
@@ -47,14 +47,14 @@ const mergeBrowserWindowOptions = function (embedder, options) {
     options.webPreferences = {}
   }
   if (embedder.browserWindowOptions != null) {
-    let parentOptions = {...embedder.browserWindowOptions}
+    let parentOptions = embedder.browserWindowOptions
 
     // if parent's visibility is available, that overrides 'show' flag (#12125)
     const win = BrowserWindow.fromWebContents(embedder.webContents)
     if (win != null) {
       const show = win.isVisible()
       if (typeof show === 'boolean') {
-        parentOptions.show = show
+        parentOptions = {...embedder.browserWindowOptions, show: show}
       }
     }