diff --git a/lib/pleroma/web/activity_pub/views/user_view.ex b/lib/pleroma/web/activity_pub/views/user_view.ex
index 639519e0a..4a83ac980 100644
--- a/lib/pleroma/web/activity_pub/views/user_view.ex
+++ b/lib/pleroma/web/activity_pub/views/user_view.ex
@@ -45,6 +45,7 @@ def render("service.json", %{user: user}) do
       "following" => "#{user.ap_id}/following",
       "followers" => "#{user.ap_id}/followers",
       "inbox" => "#{user.ap_id}/inbox",
+      "preferredUsername" => user.nickname,
       "name" => "Pleroma",
       "summary" =>
         "An internal service actor for this Pleroma instance.  No user-serviceable parts inside.",