diff --git a/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts b/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts
index 85b0d5a8b6c..6999c441c59 100644
--- a/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts
+++ b/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts
@@ -26,10 +26,12 @@ export class WebviewInput extends EditorInput {
 	private readonly _onDisposeWebview = this._register(new Emitter<void>());
 	readonly onDisposeWebview = this._onDisposeWebview.event;
 
-	readonly resource = URI.from({
-		scheme: WebviewPanelResourceScheme,
-		path: `webview-panel/webview-${this.id}`
-	});
+	get resource() {
+		return URI.from({
+			scheme: WebviewPanelResourceScheme,
+			path: `webview-panel/webview-${this.id}`
+		});
+	}
 
 	constructor(
 		public readonly id: string,