diff --git a/spec/system/page_objects/modals/assign.rb b/spec/system/page_objects/modals/assign.rb
index afe51e93..91e4fea2 100644
--- a/spec/system/page_objects/modals/assign.rb
+++ b/spec/system/page_objects/modals/assign.rb
@@ -19,7 +19,7 @@ def note=(note)
       end
 
       def confirm
-        find(".modal-footer .btn-primary").click
+        find(".d-modal__footer .btn-primary").click
       end
     end
   end
diff --git a/test/javascripts/acceptance/assigns-tab-user-menu-test.js b/test/javascripts/acceptance/assigns-tab-user-menu-test.js
index d80ff309..394dc22d 100644
--- a/test/javascripts/acceptance/assigns-tab-user-menu-test.js
+++ b/test/javascripts/acceptance/assigns-tab-user-menu-test.js
@@ -262,13 +262,13 @@ acceptance("Discourse Assign | user menu", function (needs) {
     assert.false(markRead, "mark-read request isn't sent");
     assert.strictEqual(
       query(
-        ".dismiss-notification-confirmation .modal-body"
+        ".dismiss-notification-confirmation .d-modal__body"
       ).textContent.trim(),
       I18n.t("notifications.dismiss_confirmation.body.assigns", { count: 173 }),
       "dismiss confirmation modal is shown"
     );
 
-    await click(".modal-footer .btn-primary");
+    await click(".d-modal__footer .btn-primary");
     assert.true(markRead, "mark-read request is sent");
     assert.dom(".notifications-dismiss").doesNotExist("dismiss button is gone");
     assert
@@ -312,7 +312,7 @@ acceptance("Discourse Assign | user menu", function (needs) {
     await click(".notifications-dismiss");
     assert.false(markRead, "a request to the server is not made");
     assert
-      .dom(".dismiss-notification-confirmation .modal-body")
+      .dom(".dismiss-notification-confirmation .d-modal__body")
       .exists("the dismiss notification confirmation modal is present");
   });
 });