diff --git a/api/js/jsapi/egw_app.ts b/api/js/jsapi/egw_app.ts
index 136fab16d8..a7b88d605f 100644
--- a/api/js/jsapi/egw_app.ts
+++ b/api/js/jsapi/egw_app.ts
@@ -755,7 +755,7 @@ export abstract class EgwApp
 	 * @param _menuaction
 	 * @return Promise<Et2Dialog>
 	 */
-	openDialog(_menuaction : string)
+	openDialog(_menuaction : string) : Promise<Et2Dialog>
 	{
 		let resolver;
 		let rejector;
diff --git a/api/js/jsapi/egw_global.d.ts b/api/js/jsapi/egw_global.d.ts
index 93b2df84df..26125c89ab 100644
--- a/api/js/jsapi/egw_global.d.ts
+++ b/api/js/jsapi/egw_global.d.ts
@@ -14,6 +14,7 @@
  */
 
 import type {EgwApp} from "./egw_app";
+import type {Et2Dialog} from "../etemplate/Et2Dialog/Et2Dialog";
 
 /**
  * Global egw object (for now created by the diverse JavaScript files) with a TypeScript interface
@@ -1118,9 +1119,9 @@ declare interface IegwWndLocal extends IegwGlobal
 	 * For popups you have to use the app.ts method openDialog(), which creates the dialog in the correct window / popup.
 	 *
 	 * @param string _menuaction
-	 * @return Promise<any>
+	 * @return Promise<Et2Dialog>
 	 */
-	openDialog(_menuaction : string) : Promise<any>;
+	openDialog(_menuaction : string) : Promise<Et2Dialog>;
 
 	/**
 	 * Open a (centered) popup window with given size and url