diff --git a/setup.cfg b/setup.cfg
index 894488e3..69f4ab41 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -86,8 +86,8 @@ test =
     pytest-cov>=2.11.1
     pytest-xdist>=2.2.0
     python-xmp-toolkit==2.0.1  # also requires apt-get install libexempi3
-    types-humanfriendly
     types-Pillow
+    types-humanfriendly
 watcher =
     watchdog>=1.0.2
 webservice =
diff --git a/src/ocrmypdf/_pipeline.py b/src/ocrmypdf/_pipeline.py
index af7e6f9d..7e545adf 100644
--- a/src/ocrmypdf/_pipeline.py
+++ b/src/ocrmypdf/_pipeline.py
@@ -494,7 +494,7 @@ def preprocess_deskew(input_file: Path, page_context: PageContext):
         deskewed = im.rotate(
             deskew_angle_degrees,
             resample=BICUBIC,
-            fillcolor=ImageColor.getcolor('white', mode=im.mode),
+            fillcolor=ImageColor.getcolor('white', mode=im.mode),  # type: ignore
         )
         deskewed.save(output_file, dpi=dpi)
 
diff --git a/src/ocrmypdf/subprocess/_windows.py b/src/ocrmypdf/subprocess/_windows.py
index c610c35c..705926f4 100644
--- a/src/ocrmypdf/subprocess/_windows.py
+++ b/src/ocrmypdf/subprocess/_windows.py
@@ -20,7 +20,9 @@ from typing import Any, Callable, Iterable, Iterator, Set, Tuple, TypeVar
 try:
     import winreg
 except ModuleNotFoundError as _notfound_ex:
-    raise ModuleNotFoundError("This module is for Windows only") from _notfound_ex
+    from unittest import mock
+
+    winreg = mock.MagicMock()
 
 log = logging.getLogger(__name__)