diff --git a/lib/pleroma/web/mastodon_api/controllers/scheduled_activity_controller.ex b/lib/pleroma/web/mastodon_api/controllers/scheduled_activity_controller.ex
index 0392fcef1..1b7095ec5 100644
--- a/lib/pleroma/web/mastodon_api/controllers/scheduled_activity_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/scheduled_activity_controller.ex
@@ -13,7 +13,7 @@ defmodule Pleroma.Web.MastodonAPI.ScheduledActivityController do
 
   @oauth_read_actions [:show, :index]
 
-  plug(Pleroma.Web.ApiSpec.CastAndValidate)
+  plug(Pleroma.Web.ApiSpec.CastAndValidate, replace_params: false)
   plug(OAuthScopesPlug, %{scopes: ["read:statuses"]} when action in @oauth_read_actions)
   plug(OAuthScopesPlug, %{scopes: ["write:statuses"]} when action not in @oauth_read_actions)
   plug(:assign_scheduled_activity when action != :index)
@@ -23,7 +23,7 @@ defmodule Pleroma.Web.MastodonAPI.ScheduledActivityController do
   defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.ScheduledActivityOperation
 
   @doc "GET /api/v1/scheduled_statuses"
-  def index(%{assigns: %{user: user}} = conn, params) do
+  def index(%{assigns: %{user: user}, private: %{open_api_spex: %{params: params}}} = conn, _) do
     params = Map.new(params, fn {key, value} -> {to_string(key), value} end)
 
     with scheduled_activities <- MastodonAPI.get_scheduled_activities(user, params) do
@@ -39,7 +39,13 @@ def show(%{assigns: %{scheduled_activity: scheduled_activity}} = conn, _params)
   end
 
   @doc "PUT /api/v1/scheduled_statuses/:id"
-  def update(%{assigns: %{scheduled_activity: scheduled_activity}, body_params: params} = conn, _) do
+  def update(
+        %{
+          assigns: %{scheduled_activity: scheduled_activity},
+          private: %{open_api_spex: %{body_params: params}}
+        } = conn,
+        _
+      ) do
     with {:ok, scheduled_activity} <- ScheduledActivity.update(scheduled_activity, params) do
       render(conn, "show.json", scheduled_activity: scheduled_activity)
     end
@@ -52,7 +58,10 @@ def delete(%{assigns: %{scheduled_activity: scheduled_activity}} = conn, _params
     end
   end
 
-  defp assign_scheduled_activity(%{assigns: %{user: user}, params: %{id: id}} = conn, _) do
+  defp assign_scheduled_activity(
+         %{assigns: %{user: user}, private: %{open_api_spex: %{params: %{id: id}}}} = conn,
+         _
+       ) do
     case ScheduledActivity.get(user, id) do
       %ScheduledActivity{} = activity -> assign(conn, :scheduled_activity, activity)
       nil -> Pleroma.Web.MastodonAPI.FallbackController.call(conn, {:error, :not_found}) |> halt()