diff --git a/pkgs/by-name/du/duplicity/package.nix b/pkgs/by-name/du/duplicity/package.nix
index 2e15d2aaca06..682137beb903 100644
--- a/pkgs/by-name/du/duplicity/package.nix
+++ b/pkgs/by-name/du/duplicity/package.nix
@@ -56,6 +56,7 @@ let
       # ************* Module duplicity.backends.swiftbackend
       # duplicity/backends/swiftbackend.py:176: [E0401(import-error), SwiftBackend._put] Unable to import 'swiftclient.service'
       "test_pylint"
+      "test_black"
     ];
 
     nativeBuildInputs = [
@@ -65,7 +66,6 @@ let
       wrapGAppsNoGuiHook
       python3.pkgs.setuptools-scm
       python3.pkgs.pycodestyle
-      python3.pkgs.black
       python3.pkgs.pylint
     ];