diff --git a/packages/plugin-ext/src/main/browser/custom-editors/custom-editors-main.ts b/packages/plugin-ext/src/main/browser/custom-editors/custom-editors-main.ts
index 2a9ee5d3089a1..a5d2773949b1f 100644
--- a/packages/plugin-ext/src/main/browser/custom-editors/custom-editors-main.ts
+++ b/packages/plugin-ext/src/main/browser/custom-editors/custom-editors-main.ts
@@ -25,7 +25,7 @@ import { RPCProtocol } from '../../../common/rpc-protocol';
 import { HostedPluginSupport } from '../../../hosted/browser/hosted-plugin';
 import { PluginCustomEditorRegistry } from './plugin-custom-editor-registry';
 import { CustomEditorWidget } from './custom-editor-widget';
-import { Emitter, Event } from '@theia/core';
+import { Emitter } from '@theia/core';
 import { UriComponents } from '../../../common/uri-components';
 import { URI } from 'vscode-uri';
 import TheiaURI from '@theia/core/lib/common/uri';
@@ -247,7 +247,6 @@ export interface CustomEditorModel extends Saveable, Disposable {
     readonly resource: URI;
     readonly readonly: boolean;
     readonly dirty: boolean;
-    readonly onDirtyChanged: Event<void>;
 
     revert(options?: Saveable.RevertOptions): Promise<void>;
     saveCustomEditor(options?: SaveOptions): Promise<void>;