diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index d1d48cd0a..59898457b 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -125,8 +125,8 @@ def render("status.json", %{activity: %{data: %{"object" => object}} = activity}
       uri: object["id"],
       url: object["external_url"] || object["id"],
       account: AccountView.render("account.json", %{user: user}),
-      in_reply_to_id: reply_to && reply_to.id,
-      in_reply_to_account_id: reply_to_user && reply_to_user.id,
+      in_reply_to_id: reply_to && to_string(reply_to.id),
+      in_reply_to_account_id: reply_to_user && to_string(reply_to_user.id),
       reblog: nil,
       content: HtmlSanitizeEx.basic_html(object["content"]),
       created_at: created_at,
diff --git a/test/web/mastodon_api/status_view_test.exs b/test/web/mastodon_api/status_view_test.exs
index d9a0a8a95..d28c3cbad 100644
--- a/test/web/mastodon_api/status_view_test.exs
+++ b/test/web/mastodon_api/status_view_test.exs
@@ -64,11 +64,11 @@ test "a reply" do
 
     status = StatusView.render("status.json", %{activity: activity})
 
-    assert status.in_reply_to_id == note.id
+    assert status.in_reply_to_id == to_string(note.id)
 
     [status] = StatusView.render("index.json", %{activities: [activity], as: :activity})
 
-    assert status.in_reply_to_id == note.id
+    assert status.in_reply_to_id == to_string(note.id)
   end
 
   test "contains mentions" do