diff --git a/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs
index 750296230..b92fd8afa 100644
--- a/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs
@@ -6,8 +6,10 @@ defmodule Pleroma.Web.MastodonAPI.MediaControllerTest do
   use Pleroma.Web.ConnCase
 
   import ExUnit.CaptureLog
+  import Mox
 
   alias Pleroma.Object
+  alias Pleroma.UnstubbedConfigMock, as: ConfigMock
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.ActivityPub
 
@@ -15,6 +17,9 @@ defmodule Pleroma.Web.MastodonAPI.MediaControllerTest do
     setup do: oauth_access(["write:media"])
 
     setup do
+      ConfigMock
+      |> stub_with(Pleroma.Test.StaticConfig)
+
       image = %Plug.Upload{
         content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
@@ -145,6 +150,9 @@ defmodule Pleroma.Web.MastodonAPI.MediaControllerTest do
     setup do: oauth_access(["write:media"])
 
     setup %{user: actor} do
+      ConfigMock
+      |> stub_with(Pleroma.Test.StaticConfig)
+
       file = %Plug.Upload{
         content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
@@ -177,6 +185,9 @@ defmodule Pleroma.Web.MastodonAPI.MediaControllerTest do
     setup do: oauth_access(["read:media"])
 
     setup %{user: actor} do
+      ConfigMock
+      |> stub_with(Pleroma.Test.StaticConfig)
+
       file = %Plug.Upload{
         content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
diff --git a/test/test_helper.exs b/test/test_helper.exs
index ddce27015..b7b476bdc 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -20,6 +20,10 @@ ExUnit.after_suite(fn _results ->
 end)
 
 defmodule Pleroma.Test.StaticConfig do
+  @moduledoc """
+  This module provides a Config that is completely static, built at startup time from the environment. It's safe to use in testing as it will not modify any state.
+  """
+
   @behaviour Pleroma.Config.Getting
   @config Application.get_all_env(:pleroma)