diff --git a/pyproject.toml b/pyproject.toml
index 83d8de0d018..b29fa9c90cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -257,7 +257,6 @@ module = [
     "tests.test_builders.test_build_html_assets",
     "tests.test_builders.test_build_html_maths",
     "tests.test_builders.test_build_html_numfig",
-    "tests.test_builders.test_build_html_tocdepth",
     "tests.test_builders.test_build_html_toctree",
     "tests.test_builders.test_build_linkcheck",
     "tests.test_builders.test_build_warnings",
diff --git a/tests/test_builders/test_build_html_tocdepth.py b/tests/test_builders/test_build_html_tocdepth.py
index 003ba02e5f0..0fe83e0ff34 100644
--- a/tests/test_builders/test_build_html_tocdepth.py
+++ b/tests/test_builders/test_build_html_tocdepth.py
@@ -2,11 +2,20 @@
 
 from __future__ import annotations
 
+from typing import TYPE_CHECKING
+
 import pytest
 
 from tests.test_builders.xpath_html_util import _intradocument_hyperlink_check
 from tests.test_builders.xpath_util import check_xpath
 
+if TYPE_CHECKING:
+    from collections.abc import Callable
+    from pathlib import Path
+    from xml.etree.ElementTree import ElementTree
+
+    from sphinx.testing.util import SphinxTestApp
+
 
 @pytest.mark.parametrize(
     ('fname', 'path', 'check', 'be_found'),
@@ -68,7 +77,14 @@
 )
 @pytest.mark.sphinx('html', testroot='tocdepth')
 @pytest.mark.test_params(shared_result='test_build_html_tocdepth')
-def test_tocdepth(app, cached_etree_parse, fname, path, check, be_found):
+def test_tocdepth(
+    app: SphinxTestApp,
+    cached_etree_parse: Callable[[Path], ElementTree],
+    fname: str,
+    path: str,
+    check: str,
+    be_found: bool,
+) -> None:
     app.build()
     # https://github.com/sphinx-doc/sphinx/issues/1251
     check_xpath(cached_etree_parse(app.outdir / fname), fname, path, check, be_found)
@@ -111,6 +127,10 @@ def test_tocdepth(app, cached_etree_parse, fname, path, check, be_found):
 )
 @pytest.mark.sphinx('singlehtml', testroot='tocdepth')
 @pytest.mark.test_params(shared_result='test_build_html_tocdepth')
-def test_tocdepth_singlehtml(app, cached_etree_parse, expect):
+def test_tocdepth_singlehtml(
+    app: SphinxTestApp,
+    cached_etree_parse: Callable[[Path], ElementTree],
+    expect: tuple[str, str, bool],
+) -> None:
     app.build()
     check_xpath(cached_etree_parse(app.outdir / 'index.html'), 'index.html', *expect)