diff --git a/src/platform/web/ui/session/room/timeline/AnnouncementView.js b/src/platform/web/ui/session/room/timeline/AnnouncementView.js
index 268bf0fa..5ae92daa 100644
--- a/src/platform/web/ui/session/room/timeline/AnnouncementView.js
+++ b/src/platform/web/ui/session/room/timeline/AnnouncementView.js
@@ -17,6 +17,11 @@ limitations under the License.
 import {TemplateView} from "../../../general/TemplateView";
 
 export class AnnouncementView extends TemplateView {
+    // ignore other arguments
+    constructor(vm) {
+        super(vm);
+    }
+
     render(t) {
         return t.li({className: "AnnouncementView"}, t.div(vm => vm.announcement));
     }
diff --git a/src/platform/web/ui/session/room/timeline/GapView.js b/src/platform/web/ui/session/room/timeline/GapView.js
index 2d3bd6e8..db6cda59 100644
--- a/src/platform/web/ui/session/room/timeline/GapView.js
+++ b/src/platform/web/ui/session/room/timeline/GapView.js
@@ -18,6 +18,11 @@ import {TemplateView} from "../../../general/TemplateView";
 import {spinner} from "../../../common.js";
 
 export class GapView extends TemplateView {
+    // ignore other argument
+    constructor(vm) {
+        super(vm);
+    }
+
     render(t) {
         const className = {
             GapView: true,