diff --git a/docs/api/differences_in_mastoapi_responses.md b/docs/api/differences_in_mastoapi_responses.md
index c69734e72..1350ace43 100644
--- a/docs/api/differences_in_mastoapi_responses.md
+++ b/docs/api/differences_in_mastoapi_responses.md
@@ -79,3 +79,4 @@ Additional parameters can be added to the JSON body/Form data:
 - `hide_follows` - if true, user's follows will be hidden
 - `hide_favorites` - if true, user's favorites timeline will be hidden
 - `show_role` - if true, user's role (e.g admin, moderator) will be exposed to anyone in the API
+- `default_scope` - the scope returned under `privacy` key in Source subentity
diff --git a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
index 9179a2682..811a45c79 100644
--- a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
+++ b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
@@ -103,6 +103,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
           {:ok, ControllerHelper.truthy_param?(value)}
         end)
       end)
+      |> add_if_present(params, "default_scope", :default_scope)
       |> add_if_present(params, "header", :banner, fn value ->
         with %Plug.Upload{} <- value,
              {:ok, object} <- ActivityPub.upload(value, type: :banner) do
diff --git a/test/web/mastodon_api/mastodon_api_controller_test.exs b/test/web/mastodon_api/mastodon_api_controller_test.exs
index aea0afa25..c2a12d3c7 100644
--- a/test/web/mastodon_api/mastodon_api_controller_test.exs
+++ b/test/web/mastodon_api/mastodon_api_controller_test.exs
@@ -2214,6 +2214,18 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIControllerTest do
       assert user["locked"] == true
     end
 
+    test "updates the user's default scope", %{conn: conn} do
+      user = insert(:user)
+
+      conn =
+        conn
+        |> assign(:user, user)
+        |> patch("/api/v1/accounts/update_credentials", %{default_scope: "cofe"})
+
+      assert user = json_response(conn, 200)
+      assert user["source"]["privacy"] == "cofe"
+    end
+
     test "updates the user's hide_followers status", %{conn: conn} do
       user = insert(:user)