diff --git a/config/test.exs b/config/test.exs
index 6bba555b0..f413af5c2 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -159,6 +159,9 @@ config :pleroma, Pleroma.Uploaders.IPFS, config_impl: Pleroma.UnstubbedConfigMoc
 config :pleroma, Pleroma.Web.Plugs.HTTPSecurityPlug, config_impl: Pleroma.StaticStubbedConfigMock
 config :pleroma, Pleroma.Web.Plugs.HTTPSignaturePlug, config_impl: Pleroma.StaticStubbedConfigMock
 
+config :pleroma, Pleroma.Upload.Filter.AnonymizeFilename,
+  config_impl: Pleroma.StaticStubbedConfigMock
+
 config :pleroma, Pleroma.Signature, http_signatures_impl: Pleroma.StubbedHTTPSignaturesMock
 
 peer_module =
diff --git a/lib/pleroma/upload/filter/anonymize_filename.ex b/lib/pleroma/upload/filter/anonymize_filename.ex
index 234ccb6bb..c0ad70368 100644
--- a/lib/pleroma/upload/filter/anonymize_filename.ex
+++ b/lib/pleroma/upload/filter/anonymize_filename.ex
@@ -10,7 +10,7 @@ defmodule Pleroma.Upload.Filter.AnonymizeFilename do
   """
   @behaviour Pleroma.Upload.Filter
 
-  alias Pleroma.Config
+  @config_impl Application.compile_env(:pleroma, [__MODULE__, :config_impl], Pleroma.Config)
   alias Pleroma.Upload
 
   def filter(%Upload{name: name} = upload) do
@@ -23,7 +23,7 @@ defmodule Pleroma.Upload.Filter.AnonymizeFilename do
 
   @spec predefined_name(String.t()) :: String.t() | nil
   defp predefined_name(extension) do
-    with name when not is_nil(name) <- Config.get([__MODULE__, :text]),
+    with name when not is_nil(name) <- @config_impl.get([__MODULE__, :text]),
          do: String.replace(name, "{extension}", extension)
   end
 
diff --git a/test/pleroma/upload/filter/anonymize_filename_test.exs b/test/pleroma/upload/filter/anonymize_filename_test.exs
index 9b94b91c3..0f817a5a1 100644
--- a/test/pleroma/upload/filter/anonymize_filename_test.exs
+++ b/test/pleroma/upload/filter/anonymize_filename_test.exs
@@ -3,9 +3,11 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Upload.Filter.AnonymizeFilenameTest do
-  use Pleroma.DataCase
+  use Pleroma.DataCase, async: true
 
+  import Mox
   alias Pleroma.Upload
+  alias Pleroma.StaticStubbedConfigMock, as: ConfigMock
 
   setup do
     File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
@@ -19,21 +21,26 @@ defmodule Pleroma.Upload.Filter.AnonymizeFilenameTest do
     %{upload_file: upload_file}
   end
 
-  setup do: clear_config([Pleroma.Upload.Filter.AnonymizeFilename, :text])
-
   test "it replaces filename on pre-defined text", %{upload_file: upload_file} do
-    clear_config([Upload.Filter.AnonymizeFilename, :text], "custom-file.png")
+    ConfigMock
+    |> stub(:get, fn [Upload.Filter.AnonymizeFilename, :text] -> "custom-file.png" end)
+
     {:ok, :filtered, %Upload{name: name}} = Upload.Filter.AnonymizeFilename.filter(upload_file)
     assert name == "custom-file.png"
   end
 
   test "it replaces filename on pre-defined text expression", %{upload_file: upload_file} do
-    clear_config([Upload.Filter.AnonymizeFilename, :text], "custom-file.{extension}")
+    ConfigMock
+    |> stub(:get, fn [Upload.Filter.AnonymizeFilename, :text] -> "custom-file.{extension}" end)
+
     {:ok, :filtered, %Upload{name: name}} = Upload.Filter.AnonymizeFilename.filter(upload_file)
     assert name == "custom-file.jpg"
   end
 
   test "it replaces filename on random text", %{upload_file: upload_file} do
+    ConfigMock
+    |> stub(:get, fn [Upload.Filter.AnonymizeFilename, :text] -> nil end)
+
     {:ok, :filtered, %Upload{name: name}} = Upload.Filter.AnonymizeFilename.filter(upload_file)
     assert <<_::bytes-size(14)>> <> ".jpg" = name
     refute name == "an… image.jpg"
diff --git a/test/pleroma/upload/filter_test.exs b/test/pleroma/upload/filter_test.exs
index 706fc9ac7..79bc369a6 100644
--- a/test/pleroma/upload/filter_test.exs
+++ b/test/pleroma/upload/filter_test.exs
@@ -5,12 +5,13 @@
 defmodule Pleroma.Upload.FilterTest do
   use Pleroma.DataCase
 
+  import Mox
   alias Pleroma.Upload.Filter
-
-  setup do: clear_config([Pleroma.Upload.Filter.AnonymizeFilename, :text])
+  alias Pleroma.StaticStubbedConfigMock, as: ConfigMock
 
   test "applies filters" do
-    clear_config([Pleroma.Upload.Filter.AnonymizeFilename, :text], "custom-file.png")
+    ConfigMock
+    |> stub(:get, fn [Pleroma.Upload.Filter.AnonymizeFilename, :text] -> "custom-file.png" end)
 
     File.cp!(
       "test/fixtures/image.jpg",