diff --git a/pyproject.toml b/pyproject.toml
index e3418ab98a2..fc40ff5e965 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -244,8 +244,6 @@ module = [
     # tests/test_theming
     "tests.test_theming.test_templating",
     "tests.test_theming.test_theming",
-    # tests/test_transforms
-    "tests.test_transforms.test_transforms_post_transforms_images",
     # tests/test_writers
     "tests.test_writers.test_docutilsconf",
 ]
diff --git a/tests/test_transforms/test_transforms_post_transforms_images.py b/tests/test_transforms/test_transforms_post_transforms_images.py
index c6c80f59c62..6a0e4e9ae8b 100644
--- a/tests/test_transforms/test_transforms_post_transforms_images.py
+++ b/tests/test_transforms/test_transforms_post_transforms_images.py
@@ -1,12 +1,16 @@
 from __future__ import annotations
 
 from types import SimpleNamespace
+from typing import TYPE_CHECKING
 
 from docutils import nodes
 
 from sphinx.transforms.post_transforms.images import ImageConverter
 from sphinx.util.docutils import new_document
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
 WEBP_DATA = (
     b'RIFF\xa8\x01\x00\x00WEBPVP8X\n\x00\x00\x00'
     b"\x10\x00\x00\x00\x0f\x00\x00\x0f\x00\x00ALPH\xc3\x00\x00\x00\x01'"
@@ -33,7 +37,7 @@
 )
 
 
-def test_guess_mimetype_webp(tmp_path):
+def test_guess_mimetype_webp(tmp_path: Path) -> None:
     document = new_document('<source>')
     document.settings.env = SimpleNamespace(srcdir=tmp_path)
     converter = ImageConverter(document)