diff --git a/lib/pleroma/web/admin_api/controllers/instance_document_controller.ex b/lib/pleroma/web/admin_api/controllers/instance_document_controller.ex
index 990a94313..a35878926 100644
--- a/lib/pleroma/web/admin_api/controllers/instance_document_controller.ex
+++ b/lib/pleroma/web/admin_api/controllers/instance_document_controller.ex
@@ -27,7 +27,7 @@ defmodule Pleroma.Web.AdminAPI.InstanceDocumentController do
     end
   end
 
-  def update(%{body_params: %{file: file}} = conn, %{name: document_name}) do
+  def update(%{body_params: %{"file" => file}} = conn, %{name: document_name}) do
     with {:ok, url} <- InstanceDocument.put(document_name, file.path) do
       json(conn, %{"url" => url})
     end
diff --git a/lib/pleroma/web/api_spec/operations/admin/instance_document_operation.ex b/lib/pleroma/web/api_spec/operations/admin/instance_document_operation.ex
index fc0de499b..b2a1ba8ad 100644
--- a/lib/pleroma/web/api_spec/operations/admin/instance_document_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/admin/instance_document_operation.ex
@@ -61,9 +61,9 @@ defmodule Pleroma.Web.ApiSpec.Admin.InstanceDocumentOperation do
       title: "UpdateRequest",
       description: "POST body for uploading the file",
       type: :object,
-      required: [:file],
+      required: ["file"],
       properties: %{
-        file: %Schema{
+        "file" => %Schema{
           type: :string,
           format: :binary,
           description: "The file to be uploaded, using multipart form data."