diff --git a/tests/test_link_checker.py b/tests/test_link_checker.py
index 50c787c..5a9b4d9 100644
--- a/tests/test_link_checker.py
+++ b/tests/test_link_checker.py
@@ -510,6 +510,7 @@ def test__github_link_invalid(self, root, payload):
         [
             {"string": "This link is [ok](https://github.com/ppy/osu-wiki/blob/master/wiki/Another_article/en.md).", "resolved_location": "wiki/Another_article/en.md"},
             {"string": "This link is [also ok](https://github.com/ppy/osu-wiki/tree/master/wiki/Another_article).", "resolved_location": "wiki/Another_article"},
+            {"string": "This link is [very ok](https://github.com/ppy/osu-wiki/tree/master/news).", "resolved_location": "news"},
             {"string": "This link is [another ok link](https://github.com/ppy/osu-wiki/tree/master/README.md).", "resolved_location": "README.md"},
         ]
     )
@@ -517,6 +518,7 @@ def test__github_link_valid(self, root, payload):
         utils.create_files(
             root,
             ('wiki/Another_article/en.md', '# Another article'),
+            ('news/2023/newspost.md', '# news post'),
             ('README.md', '# Please read me')
         )
 
diff --git a/wikitools/file_utils.py b/wikitools/file_utils.py
index 23088f8..898cd7c 100644
--- a/wikitools/file_utils.py
+++ b/wikitools/file_utils.py
@@ -51,7 +51,7 @@ def exists_case_insensitive(path: pathlib.Path) -> bool:
         # case-insensitive directory/file existence checking isn't trivial in case-sensitive file systems because os-provided existence checks can't be relied upon
         # this cache would only become invalid when the current working directory changes, which only happens in tests and not during normal execution
         if not hasattr(exists_case_insensitive, 'all_article_paths_lowercased'):
-            article_set = set(normalised(article_path.lower()) for article_path in itertools.chain(list_all_dirs(), list_all_files(["."])))
+            article_set = set(normalised(article_path.lower()) for article_path in itertools.chain(list_all_dirs(["."]), list_all_files(["."])))
             setattr(exists_case_insensitive, 'all_article_paths_lowercased', article_set)
         all_article_paths_lowercased = getattr(exists_case_insensitive, 'all_article_paths_lowercased')