diff --git a/src/vs/workbench/contrib/webview/electron-browser/pre/electron-index.js b/src/vs/workbench/contrib/webview/electron-browser/pre/electron-index.js
index 293eecf7851d91270934a3882e44b195cbaffcd9..3dfdad8b2b34760e5ac237296141adb8fe333c0e 100644
--- a/src/vs/workbench/contrib/webview/electron-browser/pre/electron-index.js
+++ b/src/vs/workbench/contrib/webview/electron-browser/pre/electron-index.js
@@ -24,6 +24,7 @@
 	 * @type {import('../../browser/pre/main').WebviewHost}
 	 */
 	const host = {
+		onElectron: true,
 		postMessage: (channel, data) => {
 			ipcRenderer.sendToHost(channel, data);
 		},