diff --git a/preferences/js/app.ts b/preferences/js/app.ts
new file mode 100644
index 0000000000..88f5947b23
--- /dev/null
+++ b/preferences/js/app.ts
@@ -0,0 +1,44 @@
+/**
+ * EGroupware Preferences
+ *
+ * @link https://www.egroupware.org
+ * @author Ralf Becker <rb-At-egroupware.org>
+ * @package preferences
+ */
+
+import {EgwApp} from '../../api/js/jsapi/egw_app';
+
+/**
+ * JavaScript for Preferences
+ *
+ * @augments AppJS
+ */
+export class PreferencesApp extends EgwApp
+{
+	/**
+	 * Constructor
+	 *
+	 */
+	constructor()
+	{
+		// call parent
+		super("preferences");
+	}
+
+	/**
+	 * This function is called when the etemplate2 object is loaded
+	 * and ready.  If you must store a reference to the et2 object,
+	 * make sure to clean it up in destroy().
+	 *
+	 * @param et2 etemplate2 Newly ready object
+	 * @param name
+	 */
+	et2_ready(et2, name)
+	{
+		// call parent
+		super.et2_ready(et2, name);
+	}
+}
+
+// @ts-ignore
+app.classes.preferences = PreferencesApp;
diff --git a/rollup.config.js b/rollup.config.js
index 5f92ee56d6..5d00ffabbf 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -38,7 +38,7 @@ export default {
         "addressbook/js/app": "addressbook/js/app.ts",
         "admin/js/app": "admin/js/app.ts",
         "bookmarks/js/app": "bookmarks/js/app.ts",
-        "calendar/js/app.min" : "calendar/js/app.ts",
+        "calendar/js/app" : "calendar/js/app.ts",
         "collabora/js/app": "collabora/js/app.ts",
         "filemanager/js/app": "filemanager/js/app.ts",
         //"home/js/app": "home/js/app.js",
@@ -47,7 +47,7 @@ export default {
         "mail/js/app.min": "mail/js/app.js",
         //"news_admin/js/app.min": "news_admin/js/app.js",
         "notifications/js/notificationajaxpopup.min": "notifications/js/notificationajaxpopup.js",
-        //"preferences/js/app": "preferences/js/app.js",
+        "preferences/js/app": "preferences/js/app.ts",
         "projectmanager/js/app.min": "projectmanager/js/app.ts",
         "resources/js/app": "resources/js/app.ts",
         "rocketchat/js/app.min": "rocketchat/js/app.js",